Surviving the Aftermath

Feasts can be held from the Colony Square building which you'll get the blueprint for as you progress through a game with the DLC active.

Here are the two types of feast with their effects and costs:

Small Feast (major hope increase, +20 entertainment, 1d duration)
-food (depending on survivor population)
-firewood
-plastic

Large Feast (colossal hope increase, +50 entertainment, 2d duration)
-meals (depending on survivor population)
-firewood
-fuel