I used to go to book signings when we had a number of mystery book stores here in San Diego. Sadly, we're down to one quasi-mystery book store (Mysterious Galaxy - very nice people, but more sci fi than mystery) that I know of (if there are any I'm missing, please let me know) and I've pretty much given up on them. So, I'm looking forward to the Left Coast Crime event in March!
I don't have any mystery-centric bookstores near me. All of the events that I have gone to are either at libraries or "regular" bookstores. I've never been able to go to a book conference type event so I'm a little envious that you will be going to Left Coast Crime.
I know Bouchercon is this coming week and I wish they'd bring it to Boston so that I could actually attend. New England Crimebake is in a couple weeks but I'm missing that too. However, I am going to try to attend it next year as it is reasonably affordable and close enough for me to travel to.