Answer:
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