George Mason High School students and staff will be holding a series of event to raise money for the Haitian relief effort, beginning with a day-long opportunity Thursday at Flippin’ Pizza, where 20 percent of all revenues will go to the cause.. In addition, GMHS Principal Tyrone Byrd will be on hand working behind the counter from 6-10 p.m. Flippin’ Pizza is in the Flower Building at 800 W. Broad St., Falls Church.