We did a cool (I think) thing this weekend with my regular playtesting meetup group (Playtest Zero! Tuesdays and Thursdays every fortnight!) and did a showcase of games that we've playtested in 2022.
Each participant did a short 5-15 minute presentation related to one of the games they playtested last year, and either talked about the process of designing their game or some other design topic related to their game e.g. designing ambivalence, designing for worldbuilding from small details up, designing a single set of questions, designing to reflect a culture, designing to evoke a feeling, designing to fit constraints.
I thought it was really cool, and I'm looking forward to doing it again next year :)