Definitions of get together:

• noun:   a small informal social gathering
• verb:   get together socially or for a specific purpose
• verb:   become part of; become a member of a group or organization
• verb:   get people together

  Example: "Get together all those who are interested in the project"

• verb:   work together on a common enterprise of project

  Example: "The soprano and the pianist did not get together very well"