Typically if I know an actor, and they don't have time to meet during the day, they tell me to meet them before the show as they're going in. This is usually when an actor has a train to catch after the show and doesn't really have time to visit with people backstage or sign at the stage door. They tell me to meet them before the show at a certain time, because in these instances, that's what is most convenient for them.
To clarify, please don't take this as an approval of people hanging out waiting for autographs before the show. That is incredibly rude and invasive, and could potentially make them late for work (which is very serious in this business). Lest anyone tries to take my playing devil's advocate and use it as an excuse to "meet their fave" while they're trying to get to work.
Updated On: 4/12/19 at 11:23 AM