It means a place where everyone has previously decided to meet or gather :
The assemblage point for our departure is the lobby of the Waldorf Hotel.
The assembledge point for the attack will be the port on the east side of the island.
٤ أكتوبر ٢٠١٥
0
2
1
It's actually the "assembly point" if it means what I expect. As the other commentator said, it means the point at which people gather.
Example: "The assembly point for the trip is in front of the museum at 3:00pm."