January

River Walk Mud Festival - To celebrate the annual draining of San Antonio's River Walk, a festival has surfaced with a parade and selection of the Mud King and Queen for the Mud Pie Ball. The festival has taken on somewhat of a Mardi Gras feel with crazy events, partying and a generally strange reason to have a weeklong party. The purpose of draining the river is to remove the debris that has gathered at the bottom which in the past has ranged from silverware to wedding rings.

February

Mardi Gras River Parade and Fair - The River Walk becomes a watery Bourbon Street with decorated barges, costumed revelers and free-flowing fun including a crafts fair. This is one of the largest Mardi Gras celebrations outside of New Orleans and only further indicates San Antonio's love of weeklong street parties.

March

CineFestival - San Antonio's large Hispanic population shows off its film chops during the increasingly popular CineFestival. The event hosts more than 70 screenings of Mexican, Latino and Chicano films at this annual extravaganza in the Guadalupe Theater.

Dawn at the Alamo - What would San Antonio be without a festival remembering the Alamo? This commemorative weekend-long program includes reenactments and recognizes sacrifices made by the combatants on both sides of the Alamo.

April/May

Cinco de Mayo - Interestingly, this "Fifth of May" celebration actually starts during the last week of April and goes right on into May. It commemorates the Battle of Puebla between French and Mexican forces and is celebrated at Market Square as well as throughout the city.

Sources:

http://www.sanantoniocvb.com/visitors/com_history.asp

http://www.sachamber.org/relo/general_info.php

http://san.antonio.eventguide.com/