Event sign-in will be in Alamo Plaza, across from / directly west of the Alamo.

Folks from out of town will note, this is in downtown San Antonio a few blocks west of I-37 / US281, which is also west of the Alamodome, and at the east end of downtown.

You can not park on Alamo street next to the Alamo!

You can find parking at several commercial lots a couple of blocks north of there; or in the two parking garages at River Center mall. If you are a participant, and going to be there all day, the parking lots are the better deal. If you are a spectator and going home after a couple of hours, the mall is the better deal.

Below is a smaller scale map of San Antonio: