General Antonyms:
* Concentrate: To gather or bring together in one place.
* Assemble: To gather together in a group.
* Collect: To gather together items or people.
* Aggregate: To combine into a single mass or group.
Specific Antonyms (depending on context):
* Gather: To come together in a group. (For people or objects)
* Congregate: To assemble in a group, especially for a particular purpose. (For people)
* Accumulate: To gather or collect something over time. (For objects or information)
* Coalesce: To combine or fuse together. (For substances or ideas)
The best antonym will depend on the specific meaning of "disperse" in your sentence.