你们通常在万圣节做什么? 我们会开会. 用英语怎么说?

你们通常在万圣节做什么?
What do you usually do in Halloween?

我们会开会.
We would be holding a meeting.

--What do you usually do in Halloween's day?
--We would take a meeting then

What do you usually do at Halloween?
We usually have a party.

--这里的“开会”应该是“开聚会（ have a party）”，而不是 "have a meeting"

what do you often do on Holloween?we will have a meet.

what do you often do on Halloween,we usually have a rally.