It’s next weekend. Tickets are available now, and there’s usually a long line on-site, so it’s definitely better to preorder and pick up at will-call.
Several hundred coin-ops and pinball machines on free play (including several prototypes and rarities), plus competitions, workshops, film screenings, vendors, auctions…if you are a gamer and you are in the Bay Area, attendance is mandatory. It really is the high point of my summer every year.