From Noon - 9:00pm on Saturday, March 20th. Each person will receive one free, regular-size Italian Ice in the available flavor of their choice to commemorate the arrival of spring! Click here for more details abou this event. To find out where your local Rita's Italian Ice is located at, go here.
Also, they have a Birthday Club, I just signed up, so if you want some free things for your b-day, go here.