Splitting up seems best.

"You know, I need to catch up with Keith anyways. Why don't we split up, say we meet up in about half an hour?" You offer up as a compromise.

"Alright, meet up in thirty!" Allegra says as your friends go off in their respective directions, leaving you on your own. You could go see Keith now, but you also have enough time that you could probably see a single exhibit and track down Keith after.