What happens if you don't wear green on Saint Patrick's Day?

if they not wear green then get pinched

Explanation:

Saint Patrick's Day is a cultural and religious celebration and also called as Feast of Saint Patrick

and it is celebrated at death date of Saint Patrick on 17 March every year

they have rule wear green on St. Paddy Day

or if they not wear green then get pinched

there tradition wearing is green on national holiday and It is widely celebrated in Brazil, Canada, New Zealand and the United Kingdom, United States and Australia