集合場所は

the meeting place

→ 集合

phrase Rare #38,290

the meeting place 集合場所 means “meeting place,” and は marks it as the topic. In short questions, the rest of the sentence may be omitted, so 集合場所は？ can mean “Where is the meeting place?”

JA: 集合場所は駅の前です。

EN: The meeting place is in front of the station.

集合場所はどこですか？

Where are we meeting?

集合場所は？

Where are we meeting?

— 鶴は翔んでゆく (1957)

（竜）集合場所は分かってるな

(Ryu) You know where we're meeting, right?

— AKIRA (1988)

集合場所は？

Where should we meet?

— 鶴は翔んでゆく (1957)