Last year we voted for the best posts of 2015 and rewarded them with bounties and challenges. I think it's a great way to reward and draw attention to some of the best content the community has created throughout the year, so let's do that again. (And hopefully, this year, we'll be able to sort everything out before half a year has passed.)
First off, we'll need categories again, which you can nominate here. Each answer should contain a category for a challenge or answer to be rewarded. The top-voted categories will then receive separate nomination posts to find the actual winners. Like last year, I'm not going to state a fixed number of categories that will make it, but it's probably going to be between 5 and 10 again (last year, we went with 7 categories).
Feel free to resubmit proposals from last year regardless of whether they were among the final 7 or not.
Voting will last for two weeks, so that we can start nominating posts in the top categories right when the new year starts.
As a further note, we'll need reputation rewards again, so if you're willing to spend some of your reputation on a bounty for one of the winners, please leave a comment on this question, stating how much rep you'd be willing to spend.