The phrase "got together on" can be used in a variety of contexts to describe people or groups coming together for a common purpose. There are plenty of synonyms that can be used to convey a similar meaning, such as "gathered," "assembled," "converged," "united," "joined," "met up," "collected," "amassed," "clustered," "coalesced," and "came together." The choice of synonym may depend on the tone or level of formality required for the context, as well as the specific connotations of each word. Nonetheless, all of these options can provide a more nuanced and varied way of expressing the idea of people getting together.