My college has just started a math club, and I'm one of the officers, but we have no idea what to do for meetings? It's composed of freshmen through seniors and mostly math or engineering majors. Thanks!
Invite professors, post-docs and grad students to give talks about their research and maybe an overview of their respective fields aimed at undergraduates. Sometimes it can be hard for an undergrad to really learn about a field because the talks that normally go on are so full of field-specific jargon.
Pick (specific) subjects and prepare talks amongst yourselves. It's good experience for oral exams, while you're all also learning something. Maybe present a theorem, or just give definitions and an overview of a field the others don't know much about. The majors can present what they're working on.