A pep rally is a special event or gathering where people come together to show support and enthusiasm for a sports team or a cause. It is usually filled with music, cheering, and speeches to energize and motivate everyone involved. Full definition
The coalition engaged in pep rallies at Bucks Games, media interviews, letters and opinion pieces, and an appearance before the Legislative State Budget Committee. (nar.realtor)
The school held pep rallies for sports but not for academics. (sciencemag.org)
(4) Government cheerleaders held pep rallies to rally stocks. (businessinsider.com)