Been wondering about both the dates and what someone does if he or she doesn't have a photo id. Here's a link for how to get a FREE photo id aka "Election Identification Certificate" at the driver's licence bureau. (Granbury) 

And here are the dates, etc. from the SOS website

Election Outlook: Early voting for the May 9, 2015 Limited Uniform  Election runs Monday, April 27 – Tuesday, May 5