What is "hfstival"

The HFStival is an annual Washington, D.C. / Baltimore, Maryland rock festival. Held every summer from 1990 through 2006 by radio station WHFS, and annually since 2010 in commemoration of the now-defunct station's legacy, the HFStival was at its peak the largest yearly music festival on the East Coast. 55,000 to 90,000 people attended the annual event, which had traditionally been held at RFK Stadium until the station moved to Baltimore in 2005. That May, the new WHFS at 105.7 held its first HFStival at M&T Bank Stadium. Though not originally called HFStival, two earlier concerts held on the Fourth of July were the foundation for the first festival and are considered part of HFStival history.