There are a few things you can do before reefing - and I'm a fan of reefing. For one, you can flatten the main sail by tightening the outhaul and for the jib flatten by moving jib lead back which also allows the top of the jib to twist off and depower. You can also depower the main by easing the mainsheet and bringing the traveler to weather as others have said.
On my boat, with the in mast furling I replaced the "Outhaul" that was way to stretchy. It made a big difference. It used to be that when a gust hit the line would stretch, the sail would deepen, the boat would heel and the rudder would stall. Now, a gust hits the boat heals a bit, then accelerates and comes back up and not much rudder is needed. Very big difference. Unfortunately, now the sail stretches and that's causing some remaining bad behavior. The solution to that is $$$$$ for new sails.
You could also ask your guests to get their keisters out on the rail .....