Hello, hoping for some advice again! (this forum is so so useful by the way - thank you)

I'm selling my silver jewellery at 2 festivals this Summer. One has 3000 attendees and is a family friendly music and arts and crafts type festival running over 3 days, the second has around 100,000 attendees and is a surf/skate daytime festival running over 5 days and I'm really not sure how much stock to make. I have around 35 pieces in my collection. I think it's more of a case of me showcasing my pieces to a wider audience rather than selling as such, as I'm thinking people may not spend that sort of money at a festival, however obviously I want to make sure that I have enough stock in case people do buy! Does anyone have any experience or advice for me?

Thank you so much in advance. Daisy x