The performers come out, greet the crowd, and ask the audience to help liven up the show.
The words appear when the audience laughs.
お前も頑張れ!
Hey, you do your part too!
Textbookあなたも頑張ってください。Blunt "お前" replaces "あなた", and the plain imperative "頑張れ" replaces polite "頑張ってください". Fine between comedy partners, rude to strangers.