Can Vendors come to the market and sell occasionally or do they have to commit to the whole season?

Vendors can do either one! They will get a discount for signing up for the entire season or they can pay for one week at a time and come only when they can. 

Is this a vegan market?

No. The Nahsville Indiana Farmer's Market allows vendors of all varieties including meet, cheese, fruits and vegetables. Craft and plant vendors are also invited.