So, what are you guys doing on Monday night? Don't have any plans? Oh, pity — guess you weren't invited to the party of the season. Page Six skipper Richard Johnson and his lovely fiancée Sessa von Richthofen are celebrating their engagement that night at the Four Seasons' Poolroom, and we're sure everyone who's anyone (in PR) will be there at 7 P.M. sharp!

Also pertinent: The affair is hosted by Niche Media's Jason Binn and his wife Haley, who are ending the party at 9 P.M. so that they can move on to hosting the opening of an envelope.

[Image via New York Social Diary]

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