Make local announcements to the neighborhood if your race is going to take place on city streets. Surprised how many races don't do this and you go out on Saturday or Sunday only to be ambushed by rolling road closures.
Err on the side of starting the race earlier rather than later. Lot of races still have 9-10am start times before winter, and you end up racing under hotter than desired sun. Climate change, blah blah, it's getting warmer and you really want to get done racing before it warms up.
Keep the entry fee no higher than $50 for 10K and shorter, under $100 for the half. Inflation might have hit your costs but most of our disposable incomes didn't get any bigger.