Side matches are just for fun and there's never really any telling what you will find when you get to a side match. Derringers are usually two shot speed matches with the gun starting at low ready or staged on a table or something like that.
Sometimes match directors offer a .22 side match.
Some popular side matches include speed rifle, speed pistol, speed shotgun, wild bunch matches, team matches, long range rifle. One match that I attended had a derringer side match but the target was out a bit and they were going for accuracy rather than speed. That's the only time I have seen that format for a derringer.