@James3887 Dynamic pricing isn't going to know that there is an event in your town. All it does (IMO) is measure the number of rentals that occur in your area and with your size of property and then make adjustments if you haven't been rented yet.
Decide what premium you want to put on your property for special events and add it well in advance of the event. Add your required nights -- i.e., plus one either side of the event dates or inclusive of a leading or following weekend. The more days the guest must rent for should prevent you from getting the partiers.