Robert F. Kennedy Jr., with Cheryl Hines (Getty Images)

Robert F. Kennedy Jr. learned a lesson other members of his generation of Kennedys never picked up on: Political office is all well and good, but if you really want to make change, throw a party! Mr. Kennedy’s Riverkeeper association throws its annual bash for clean-water supporters including John McEnroe, Morning Joe pundit Willie Geist and Susan Sarandon. Train will be performing, but you should still go! You’ll be educated on all the gross pollutants threatening our water supply—oh, we’ll take sparkling, thanks!

Chelsea. Invitation only.

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