Studio Aruku is holding it's 8th "Messy Live" event in Tokyo on November 2nd. LOTS of pics from past events are here, with last year's event just posted yesterday https://route207.net/sp_ml8pr.html (follow the links below the pic; the Google translate version helps https://translate.google.com/translate?sl=auto&tl=en&u=https%3A%2F%2Froute207.net%2Fsp_ml8pr.html ). More pics have been posted on Twitter recently in anticipation of the event https://twitter.com/kaji0825 . Studio Aruku feed here https://twitter.com/studio_aruku

Do they sell vids to these?

I don't think so. All I've ever seen from these events is the slide show video at the bottom of this channel, "... (Messy-Live)" https://www.youtube.com/channel/UCFbjXXX75GaYK8KOCexJQZw/ There are videos for sale here https://duga.jp/ppv/aruku/ but they all seem to predate the Messy Live events. On that DUGA site, there are vid samples on the right side of the page for each vid (again, a translate program helps).

Too bad I can't speak Japanese...