For some of who who are lost, Bootcamp is basically Quest, but you don't go to the boss if you win. instead at the end there are a bunch of chests, and if you're lucky, one of those chests will contain a key, which allows you to vote for the boss map itself.
This was in the old r2d and in r2da in halloween 2016, but it hasn't made a return since. if you're still lost, here's a link to it, as well as some references.
What i'm thinking is basically halloween bootcamp, but with the general bosses. naturally, because the key is permanent, bootcamps would be harder than the normal quest. so basically, in a nutshell, chronos bootcamp and cherrycake's bootcamp