Four teams of Twitch streamers who play League of Legends will face off against each other this weekend in the Gift the Rift tournament, with all prize money going to charity.
Each team's charity was chosen by its captain: Pokimane, LilyPichu, KayPea and xChocoBars. The $100,000 (£77,000) prize pool is split in half, with one half awarded based on tournament placing and the other half distributed through a fan vote.
First place in either the tournament or the fan vote earns a team's charity a $20,000 donation. Second place receives $15,000, third place $10,000 and fourth place $5,000.
The event will be hosted by esports interviewer Travis Gafford and NA LCS shoutcaster Captain Flowers, and can be watched on their stream or on each team's individual channel.
The teams and their charities
Pokimane chose St Jude Children's Research Hospital and will play alongside BunnyFuFuu, Yassuo, Pimpimenta and Based Yoona.
KayPea selected the British Columbia Society for the Prevention of Cruelty to Animals. Her teammates are Heisendong, Sheviii and the former Dignitas duo of ImaQTpie and Scarra.
LilyPichu is playing for Last Chance for Animals, joined by BoxBox, TheOddOne, Destiny and Xpecial. xChocoBars picked Hope For Justice, lining up with VoyBoy, PantsAreDragons, Froggen and Adrian.
Scheduling clash with NA LCS playoffs
The tournament starts at 1pm PDT (BST) on Saturday, September 1st, the same time as the NA LCS playoffs semi-final between Team SoloMid and Cloud9.
Aseef Khan, Head of Growth at Swarmio, said: "We knew NA LCS was happening but we didn't want to push the timing on this as we realized how excited the streamers were about supporting their causes and getting together for a great event." He added: "The focus is on both getting votes and views. We want votes but also are hoping to get millions of viewers."