How many cupcakes?

Hi everyone, on our weddingday come July we are doing cupcakes instead of weddingcake. They will be served after the ceremony when everyone gets a glass of prosecco to toast to our marriage (around three in the afternoon/15.00 hours). Then it will be boardgames/mingling/some family photo's until half past 5/ 17.30 when diner will start. I'm wondering how many cupcakes we should get? If everyone will come we'll be 57 people. Now we have estimated 70 cupcakes. Anyone know if that will be enough?