Speaking of #LastFM, one feature that I very much miss is the #FestivalFinder app that gave you a compatibility score with a festival based on how much of the line-up you had listened to it. I've been thinking of creating something like it, but the tricky part would be finding line-up data with a suitable licence. One solution would be adding #musicfestival line-up data to #MusicBrainz, for example here is Le Guess Who 2023 https://musicbrainz.org/event/d651146e-921a-45a4-8704-9013b9a9c174