I have a children’s birthday party business and my parties are 130 up to 20 kids and 150 up to 40 kids. This includes 1 hour of activities but its not beading. I think doing flat-rate like that is appealing and don’t go under 100.00 for the hour or over $250. If you are too cheap people think you dont know what you are doing. I think $150 for 1-1.5 hours including supplies would be competitive in most markets. Also, 1-1.5 hours is the top attention span at a party. EVPJTX