The Lichess Bots Championship will start on June the 16th 2018. It is not an official lichess tournament. If you want your lichess BOT to participate, it has to have the pink BOT in front of its name and it has to join lichess.org/team/lichess-bots-championship before June the 15th 2018. By joining the team you promise that the lichess BOT will compete in (and complete) the tournament.
The rules of the Lichess Bots Championship can be found at lichess.org/forum/team-lichess-bots-championship/rules-of-the-lichess-bots-championship