potluck
Concise Oxford English Dictionary © 2008 Oxford University Press:
pot luck/ˈpɒtlʌk/
▶noun
- 1 the chance that whatever is available will prove to be good or acceptable.
- 2 (potluck) N. Amer. a meal in which all the guests bring a different dish to share.
'potluck' also found in these Oxford entries:

