Do you have a plan in place to let your group know about severe weather in your area? Much of the midwest cancelled most of their events last night or the night before. If there is a tornado, most people assume that your event is cancelled, but it is not always so cut-and-dry. How do you let your group know if something is cancelled or not?
Try sending out text alerts. Your group can add themselves to your subscriber list by texting in to the system. Then when the decision has to be made about whether or not cancel an event, you can let your group know quickly and effectively.