rev·el·er (US) or Brit rev·el·ler 
/ˈrɛvəlɚ/ noun
plural rev·el·ers /ˈrɛvəlɚ/ noun [count] : a person who is celebrating with other people in usually a wild and noisy way : a person who is taking part in revelry
▪ The streets were crowded with revelers on New Years Eve.
▪ The streets were crowded with revelers on New Years Eve.
