Update the passes to include the information you deem important. Print, cut apart the passes, and laminate to be reused for years to come.
I hole punch the top center and run a lanyard through so create an easy-to-carry and not-so-easy-to-lose pass.
Display in your classroom with matching sign and 6 command hooks. You can hang them below, and put a sign out sheet with it. Kids sign out, take the appropriate pass, and off they go.