I'm making changes all the time nowadays. Usually changing the capacity lower.
And yes - please be proactive. It's a real PITA to cancel an event. Even worse when the capacity is halved and there are more shooters already registered than the new lower limit. And none of the preregs wants to transfer. And really bad if some of the shooters have already been transferred multiple times due to prior cancellations. I've actually had some poor souls that have been transferred 4 times now due to cancellations. They've all been good sports about it though since they know it's out of our hands.
My take is when Fall comes around, especially near the election, then all hell is going to break loose and lockdowns will intensify.