The first 21×21 I ever constructed was for a friend's 21st birthday. The theme was slightly ridiculous, but I got it to work and included lots of easter eggs in the process. Can't lie, I was really proud of it, but it felt weird to publicly post a birthday gift.
Anyway, now it's my 21st birthday! And to mark this milestone, I made another 21x21 with the same (basic) theme. Had a lot of fun making this, and I hope you have a lot of fun solving it! Anyway, time for me to get (legally) bacchanalian (a word I unfortunately couldn't shoehorn into this puzzle).