27And they went out into the field and gathered the grapes from their vineyards and trod them and held a festival; and they went into the house of their god and ate and drank and reviled Abimelech.
House in this instance refers to their temple. They went presumably to formalize their acceptance of Gaal as their leader.
27 And they went out into the field and gathered the grapes from their vineyards and trod them and held a festival; and they went into the house of their god and ate and drank and reviled Abimelech.