Do they still have a photography class? And a tour of the Awahnee?
If you stop by the Yosemite Lodge lobby, to the right of the front desk is a sort of 'concierge' with information about tours as well as on the wall to the right {if you were to walk down the hall {towards the bathrooms on the left!} it lists their programs for the week.
The Lodge has speakers there sharing interesting topics, usually at 7 p.m. May be too late?
Night time photo classes, too, maybe....
http://www.yosemitepark.com/
Hwy 49 info....
http://www.historichwy49.com/index.html