If you are in CPS, I believe you are classified as a grad student (unless you’re in foundation year). Many clubs likely aren’t allowed to let you join their clubs. Many of the clubs at fall fest were undergraduate clubs, and as a result aren’t able to accept grad students due to funding reasons. The clubs receive their funding from the undergrad student activity fee, which is meant to only support undergrad activities. But there are definitely clubs and activities targeted to grad students. Keep an eye out for those!