I was surprised to learn that a place named "Mechanics' Institute" offers such events, as well as a film series, appearances by all kinds of authors, book clubs, classes and so on; and, that its library has a general interest collection. The institute was founded in 1854 to offer vocational education to the many left out of work when the Gold Rush of 1849 went bust. Since then, it has adapted to the needs of its members.
So, for about the cost of subscribing to a daily newspaper, I joined the club. I had to ask myself why, considering that it duplicates some of what is available from The San Francisco Public Library, and that I remain a supporter and enthusiastic user of the Public. For one things, Mechanics' has a really cool clubhouse downtown:
And for one more thing, they have this great workout center, which not only lets you get exercise, but also allows access to the four floors occupied by the institute: