@jwz mostly through fliers, but this one I heard about through word of mouth.
Almost all of my favorite events this year were found via a sheet of paper.
I think some artists and organizers are intentionally trying to keep things IRL, so they totally skip the traditional web promotion (creating a website or sending links to folks like Stuart or Johnny Funcheap).
I think about this a lot as someone who wants to promote local events yet doesn't have time to share every cool flier.