We're not a general VGM website but a database to index VGM by album, so I think that's why we basically submit a concert only to link multiple albums which are released there. That said, you can always add a college concert or such
through here. Our event section is actually based on individual submission, so nobody but the original poster can edit it later though.
(btw, has we ever assigned albums as "Resale"? The most underused feature on this site, maybe and given the amount of doujin albums, I think it's virtually impossible to follow what's resold and what's not at each event)