Theres this music festival that im participating in as a vendor. More than 4,000 people have gone. Im making cakepops and cupcakes. Im afraid that i might make to much and have left overs but than again i dont want to run out. 

Please help

In many threads people suggest that about 10% of the people will buy some. But don't know this festival and if there are other people selling cupcakes etc...