This is a self-guided crawl, not a guided tour — you get a wristband, a list of participating bars, and drink specials at each stop. The draw is the price compression: venues that don't normally discount are running specials for ticket holders. The Memorial Day timing means most participants aren't working Tuesday, which changes the energy of the back half of the night considerably.
Practical note: the crawl spans multiple neighborhoods, so wear shoes you can actually walk in. Don't drive between stops — this is genuinely a situation where Muni or a rideshare between venues is the move, not circling for parking. Eat before you go; bar food at crawl speed is unreliable.
With two hours, I'd hit the check-in bar to activate the wristband, identify the two stops closest together on the map, and treat those as the actual plan. The crawl format rewards people who don't try to do all of it.

