Why is this sentence phrased this way?
他们每隔两个月搞一次聚会 = They have a get together every two months.

I don't understand why this needs two 隔 and 个。
and why use the word 搞。

quite confused about the structure of this.

thanks in advance.

Question

Why is this sentence phrased this way?
他们每隔两个月搞一次聚会 = They have a get together every two months.

I don't understand why this needs two 隔 and 个。
and why use the word 搞。

quite confused about the structure of this.

thanks in advance.

Answer

他們每隔兩個月搞一次聚會。

他們 = They
每隔 = every (at intervals)
兩個月 = two months
搞 = to make/to do (similar to 做)
一次 = once
聚會 = gathering

*You can say 每個月, but you cannot say 每個兩個月..that is why 每隔 is used, to describe intervals of something.

Answer

隔means interveal.-----------every other two months. 
搞 is general. what you do is actually hold a party.

Answer

他们  每隔  两  个  月  搞  一次  聚会。

they every two months have a (once) meeting.

每隔 = měi-gé = every (for time periods)
搞 = gǎo = do, have