A brewery collectibles club I belong to has been doing these for years (also using PHPBB3). They're a lot of fun. There is one going on now in fact that started yesterday that is titled 'The Self-Quarantine Online Show.' We usually do just 1-day shows though where the 'live' portion of the show (hosted chat, PMs, giveaways, contests) is about 3-4 hours but the dealer rooms stay up pretty much until the next online show. We use photos, not video to depict items for sale. A host or moderator runs things and promotes chat in the chatroom and does giveaways and contests. We post rules, a hospitality room, and show what prizes will be awarded. It's pretty intense being an involved host during that 3-4 hrs. Here's the 'lobby' with the above mentioned rooms, rules etc.:
http://www.therustybunch.com/phpBB3/viewforum.php?f=429