The 30 Rock actress is hosting a 10th anniversary screening of her film Mean Girls before an audience of more than 900 people at the Upper Darby Performing Arts Center.
The center is where the Upper Darby Summer Stage series is held each summer, a program Fey took part in as a youngster.
"Before the Emmy Award-winning actress, comedian, producer and writer became a household name, Tina Fey acted, directed, ushered and worked in the box office at Upper Darby Summer Stage," Harry Dietzler, the theater's executive director, told NBC Philadelphia.
Funds raised from the event will go toward the purchase of a new $300,000 sound system for the performing arts center.
The screening is scheduled to be followed by a question-an-answer session hosted by TV Guide Magazine's Damian Holbrook, a fellow alumni of the Summer Stage program.