Have the users the option to choose a bucket for "other events" which has a different goal. This would be a category for their non-major events that they can track at an individual even level, but roll up to that goal.

For context, if they have 3 major events each year, each of which has a $5k fundraising goal.... so $15k total. and that they'll track separately.

and then like 20 small events that roll up to a goal of $5k in donations. They want to track each event so they can make decisions if it makes sense to continue doing them next year