I would like to ask for help in compiling a list of as many TCS-related conferences and workshops as possible. My main motivation for doing this is to plan possible blog coverage of more theory venues -- finding correspondents attending these events who would be willing to write either brief or in-depth blog entries about events they are attending. Beyond that, I hope a list like this would give everyone a better sense of the lay of the theory land.
I'll seed the question with an answer containing a few "obvious" conferences. Please feel free to edit my answer and/or post additional answers of your own.
Standard abbreviation of conference, name of conference, subject matter, any additional notes.
Intended as community wiki.