In addition to the overall Fiesta San Antonio 2010 news page that I started awhile back, there are also pages on specific things like the carnival and the parades.
Tonight was the River Parade, but in true Fiesta fashion there are still two more to go, the Day Parade and the Night Parade, which are officially called the Battle of the Flowers and the Fiesta Flambeau parades, respectively. The article gives you ticket information on the remaining parades.
The Carnival article gives you information about parking, directions, VIA Park and Ride, wristbands and more.
Have you gone to any Fiesta events yet?