>A very busy place
>Somewhere where there are lots of activities taking place at the same time
>A non-chaotic activity hub
>A place where people put in a lot of hard work
The phrase comes from a beehive, where bees live. Bees are traditionally deemed very active insect. There is also a similar expression “as busy as a bee“.
Example
>The completion of the project took a hive of activities to be performed.
>The restaurant on this weekend will be a hive of activities