The 6'6" guard played in 66 games at VCU, averaging 3.7 points and 2.1 rebounds per game in two seasons with the program.
Gratton's younger brother Dylan remains as a Nittany Lion.
Johnson will reconnect with former Penn State hoops head coach Pat Chambers at Florida Gulf Coast.
Petitti's past experience includes serving as COO for the MLB and multiple media executive positions.
COIN, Neon Trees, and UPSAHL will also perform at this year's festival.
Fans of Chad Powers can vote for the video on the Webby Awards' website until April 20.