I decided to write this post to summarize all we know and we hypothesized about the Cornucopia bloodbath of the unnamed tributes in the 74th Hunger Games, who are the tributes from District 3-10. All this is that I think is actually happened. I made this page also because of the quarrels about the bloodbath and the places.
District 3 boy
The District 3 boy runs for supplies, but he runs very slowly. He sees the District 7 girl grabbing a throwing axe and he throws her to the ground and steals the axe. The District 3 boy sees the District 5 boy killing his district partner, but he continues to run to grab a backpack. Marvel stops him to steal the axe, but the District 3 boy doesn't let go, which made Marvel swing his backpack at the tribute's face, causing him to fall and to let go. Later he grabs a black backpack, but the District 7 girl (whose axe was stolen by him) tries to steal it; the District 3 boy tries to again throw the girl to the ground, but she dodges the attack and punches him, winning the backpack. After this he grabs another backpack and runs to the forest. He survived the bloodbath.
District 3 girl
Like a majority of the other tributes, the District 3 girl runs to the cornucopia to grab supplies. She manages to grab a black backpack, but is confronted by the District 4 girl, who slashes at her legs with her serrated sword, injuring her. Then the District 5 boy tries to steal her backpack, but she doesn't let go, so he finishes her off, by swinging his sickle at her forehead, killing her. She placed 22nd.
District 4 boy
When the gong signales the beginning of the Games, the District 4 boy jumps over a crate and runs inside the Cornucopia a few seconds after Thresh arrived. He finds a yellow, rolled up sleeping bag, before crouching and hiding behind several crates of supplies. After the bulk of the fights had concluded he runs out of his hiding spot in an attempt to slip by, grabbing a small sword off the wall on the way. Unfortunately he makes the error of looking behind his back all the way to the mouth of the Cornucopia. When he turns around, Cato had long since noticed him and slashes his throat open. He placed 14th.
District 4 girl
When the gong rings the District 4 girl runs towards the Cornucopia. At the start at the bloodbath she sees Marvel killing the District 8 boy. Then, she sees Thresh and her district partner entering the Cornucopia. The District 6 girl tries to attack her with a serrated sword but she brutally beats her, pushes her to the floor and grabs the sword. She slashes the District 3 girl's leg with the sword. She then confronts Cato and swings her sword at his head, but he ducks. Cato knocks the serrated sword out of her hand, and then hits her abdomen with his baton, to later throw her into a crate. She then grabs a red backpack and runs to the forest. Later the Careers found her and killed her in the forest. She placed 13th.
District 5 boy
Like majority of the tributes, The District 5 boy runs for supplies. He sees the District 3 girl with a black backpack and he tries to steal it, but she doesn't let go, so he grabs a sickle, killed her (slashing her forehead) and steals her bag. Then he attacks the District 7 girl, but the District 7 boy kncoks him down with a spear, about to kill him. Fortunately for him, Thresh passes by distracting the District 7 boy, allowing him to escape with a sword. He crawls away, but is attacked by the District 6 boy, who strangles him onto a crate. He gains advantage and hurls the District 6 male's head into the crates. He runs out of the cornucopia, but Glimmer attacks him by pinning him onto a crate and immediately stabs him in the abdomen with a knife, killing him. He placed 17th.
District 6 boy
When the gong rings the District 6 boy runs towards the Cornucopia and tries to outrun Cato. Cato grabs him and beats him up. When Cato leaves, Jason gets up and sees Marvel killing the District 8 boy and runs the opposite direction. He grabs a red backpack and sees Glimmer stabbing his district partner. He was attacked by the District 7 boy, but he he punches in his face. After that, he fights the District 5 boy over a backpack, which leads to the cornucopia. The District 6 boy tried to strangle the District 5 boy, but he grabs him and smashes his head into a crate. Then the District 6 boy grabs a sword and attempts to kill Glimmer to avenge his district partner, but Cato trips him, grabs a scythe and slashes his stomach twice, killing him. He placed 15th.
District 6 girl
Like the other tributes, the District 6 girl runs for supplies. She grabs a serrated sword and attacks the District 4 girl, who brutally beats her, knocks her to the ground and steals her sword. She grabs a yellow bag but Glimmer shoves her to the ground, but the District 6 girl is able to stand up. She hides behind a crate and watches the bloodbath unfold, but is spotted by Glimmer, who grabs her by the hair and start to spin with her, but suddently, they fall to the ground, but this time Glimmer picks up a knife and stabs her to death. She placed 21st.
District 7 boy
When the gong rings, the District 7 boy runs towards the Cornucopia like most other tributes. He attacks the District 10 boy, but he is pushed to the ground by him. He attacks the District 6 boy, but he punches him in the face. Then he grabs a spear and tries to kill Cato, but is again throw to the ground. Then he sees the District 5 boy attacking his district partner, so he knocks down the District 5 male. He is about to kill him, but Thresh gets in the way, while the District 7 girl ducks and hides behind a crate. He tries to stab Thresh, but Thresh kicks the spear out of his hands and slashes his throat, killing him. He placed 19th.
District 7 girl
When the gong rings the District 7 girl runs towards the Cornucopia. She grabs a throwing axe, but the District 3 boy throws her to the ground and steals the axe. She sees the District 5 boy killing the District 3 girl and hides behind a crate to avoid the conflict. The District 5 boy smacks her with his backpack and attacks her, but she is saved by her district partner. She hides behind a crate and watches Thresh kill him. The District 3 boy grabs a black backpack and she tries to steal it; the District 3 boy try to again thow her to the ground, but she dodges the attack and punches him in the face, winning the backpack. After this, she tries to flee, but Clove rams her to the ground and Marvel spots her and spears her in the heart. Before she was killed she sees Glimmer killing the District 5 boy, the boy who was the cause of his death and his district partner's death. She placed 16th.
District 8 boy
Like most of the other tributes, the District 8 boy runs for supplies. He runs halfway until spotting a small knife, he grabs it and tries to attack Marvel, who managed to disarm him, slashes his throath, knocks him to the ground and stabs him repeatedly with a knife, killing him. He placed 24th.
District 8 girl
Like most of the other tributes, the District 8 girl runs for supplies. She sees Marvel killing her district partner. She grabs a sword at the same time as the District 9 boy does. She kicks him in the testicles and grabs the sword. She watches the District 4 girl slashing the District 3 girl's leg, so tries to slash Marvel's leg, but he thrown her into a crate. After this she runs into the forest. She survived the bloodbath.
District 9 boy
When the gong rings, the District 9 boy runs towards the Cornucopia like most other tributes. He grabs a sword at the same time as the District 8 girl, but unfortunately she kicks him in the testicles, winning the sword. Later, he grabs a two-holed sword and chases Katniss, who falls. Katniss falls and he tries to kill her with his axe, but Clove throws a knife in his back. He placed 20th.
District 9 girl
When the gong rings, the District 9 girl runs towards the Cornucopia like most other tributes. She grabs a pack of knives. She sees Clove killing her district partner, so she decided to hid behind a crate. Unfortunately, Marvel saw her, so he goes to her and stabbed her with his kukri. Her place is uncertain, but she placed around 18th.
District 10 boy
Like majority of the tributes, the District 10 boy runs to the Cornucopia for supplies. He sees his District partner dying. He manages to get a yellow bag, but the District 7 boy attacks him. He quickly throws onto the ground the District 7 boy. After this he runs in the forest. He survived the bloodbath. All this is seen in the behind scenes. However in the film it is shown he tries to pass Cato, but Cato grabs a machete and digs it in his chest, killing him. His is only an extra death and dies little after the District 8 boy does.
District 10 girl
Like majority of the tributes, the District 10 girl runs to the Cornucopia for supplies. When the gong rang, she falls. Then, she tries to grab a yellow sleeping bag, but a tribute, most likely Glimmer or Clove, chases her and stabs her with a knife, killing her. Her place is uncertain, but she placed around 23rd.
24th: D8 boy (killed by Marvel)
Extra death: D10 boy (killed by Cato)
23rd: D10 girl (presumably killed by Glimmer
22nd: D3 girl (killed by the D5 boy)
21st: D6 girl (killed by Glimmer or Clove)
20th: D9 boy (killed by Clove)
19th: D7 boy (killed by Thresh)
18th: D9 girl (presumably killed by Marvel)
17th: D5 boy (killed by Glimmer)
16th: D7 girl (killed by Marvel)
15th: D6 boy (killed by Cato)
14th: D4 boy (killed by Cato)
13th: D4 girl (killed by the Careers)
Survivors: D3 boy, D8 girl, D10 boy.