I like my releases to have a theme, I do it that way whenever possible, but I didn't count my last one as it's only themed in a personal way (I left "Tales from the Secret Annex" in a LFL across from the backstage entrance to the theatre where I played Anne Frank... but our Secret Annex has been gone from that theatre for a few years and only exists in our memories and photos now). I did another one today that I think will count for this, as the theme is more concrete/apparent.
Today, in the middle of the 2018 Winter Olympics, I left "Ice Hockey and Curling (Winter Olympic Sports)" at a Curling Club in a nearby town (my grandpa's old club). The book is geared to kids, but it's Family Day here and there were a lot of kids at the club trying out the sport, so I'm hoping one of them will take the book home :) To make the release even more apropos, they were showing Olympic hockey on the TV in the curling club lounge, lol :) http://www.bookcrossing.com/---/14917471
(the picture's not very interesting, but there is a picture)