(Strip Number 951, Original Publication Date, 1 October 1985)
Panel 1: We start things off with an excited-looking Brian telling Gordon and Michael that there's a big Halloween party coming up.
Panel 2: He then sets up the punchline by telling them Principal Warren has asked parents to chaperone.
Panel 3: Gordo asks Mike if he's gonna get get his folks to volunteer which causes Mike to question Gord's sanity.
Panel 4: Since Michael wants to have fun, there's no way he's askin'THEM!!
Summary: The problem is that Elly learns about this anyway which causes her to volunteer and thus ruin Mike's street cred for embarrassing her in public.