standing buffet party; stand-up party
A party where guests stand and eat, often with buffet-style food; common at receptions and casual gatherings.
今夜の立食パーティーには、たくさんの人が来るそうだ。
I hear many people are coming to tonight's standing buffet party.
立食パーティーでは、自由に料理を取って食べられます。
At a stand-up party, you can freely take and eat the food.