a 503c (501c3)is a not for profit, tax exempt entity. falls under the 501c codes as well as 501c7 social club . must be supported by dues from members, limited membirship, provide a place for members to meet and interact .
what you guys are talking about is either a 501c7 social / hobby club or 501c3 educational. yu have a better chance of proving hobby club for exempt status.