Not a concert at all, and the most quietly consequential thing on this week's calendar. On Monday, September 15, 1969, Stephen Gaskin held a free open consciousness lecture at the Family Dog on the Great Highway -- no band, no poster, no ticket -- reported as the first of what became his Monday Night Class (per rockarchaeology101; single-source, so the "first" framing is reported rather than proven). It is easy to forget that these halls doubled as gathering rooms on their dark nights. The class grew: within two years Gaskin and several hundred followers left San Francisco in a caravan of buses and founded the Farm in Tennessee, one of the longest-surviving intentional communities in the country. It started on a Monday in a dance hall on the beach road, and no poster archive would ever surface it.