...Just stand there and summon them by having them appear behind you! Have them touch your shoulder with their hand. Jump a little bit as if surprised. Then, say their name in a half-joking and half-annoyed way, and turn around while expecting them to be there. I've tried this out in my previous couple LDs with good results.

It's quicker than changing locations to where they may be (or, where you're just thinking they would be).