I also missed out on the Thanksgiving and Christmas outfits, but I think there were more than just those weren't there?
However, @mysticalmysty , I've seen people with a "turkey costume" Tiffi, and also what looked like a christmas themed Dachs. Now I'm not sure if the Dachs costume was event exclusive though...
Edit: @mysticalmysty mentioned I need to post my scrapbook, so here:
I should log in here more often. I finished both the 30 and 40 star challenge, so I can only post the outfit. I'm playing on windows and did pass the 1k mark yesterday :-)