Hello. My fiance and I are planning our wedding on the lawn at the college campus where we met. A permit is required to serve alcohol and specifies that only invited and of age guests may be served. The bartender will be checking IDs but the police department of the campus is concerned that it will be hard to keep uninvited guests from receiving alcohol. I am looking for a way to "mark" who is on the guest list or section off the area without taking away from the wedding.