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1) The final big event of the season was the Robert Wilson-hosted concert benefit at the Watermill Center on Saturday. Rufus Wainwright, Kate, Anna and Martha McGarrigle, and Jessye Norman performed for a crowd including Isabella Rossellini, Calvin Klein, Amanda Hearst, Steven Klein, Daphne Guinness, Patrick McMullan, Bob Colacello, Jamee Gregory, Beth Rudin DeWoody, Luigi Tadini, and Lisa Anastos. [Paper/PMc]

2) David and Sybil Yurman hosted a lunch for Grand Prix Sunday at the Hampton Classic Horse Show in Bridgehampton, where Richard Johnson and Sessa von Richthoven, Hayley and Jason Binn, Naomi Campbell, Kelly Klein, Alec Baldwin, Christie Brinkley and Alexa Ray Joel (left), Ivana Trump, Beth Ostrosky, Judith and Rudy Giuliani, Silvano and Marisa Acocella Marchetto, Peggy Siegal, Kelly Ripa, Debbie Bancroft, Bettina Zilkha, Somers White and Jonathan Farkas, and Kim Heirston and Richard Evans all watched the races and posed for pics. [PMc/Hello]

3) Later, Katie Lee and Billy Joel had a barbeque at their new Sagaponack house for a starry crowd including Howard Stern, Ivanka Trump, Christie Brinkley, Alec Baldwin, Jon Bon Jovi, Chevy Chase, Roger Waters, Penny Marshall, Rachael Ray, Lorne Michaels, Ron Perelman, Brad Grey, and Kevin Mazur. [NYDN]

4) Polo player Michael Borrico's Watermill estate was the venue on Sunday afternoon for an Evian-sponsored polo match and barbeque attended by Hugh Grant, Michael Shvo, Katie Lee Joel (who signed copies of her cookbook), Michael Chow (who served noodles), Andy and Alison Brod, Brittny Gastineau, Annabel Vartanian, Devorah Rose and Teddy John, and Kristian Laliberte, along with various Argentine polo players and their female fans. [NYO/PMc]

5) On Saturday night in Southampton, Australian art dealer Andy Valmorbida hosted a launch party for Raphael Mazzucco's book The Collected Art, designed by Giovanni Russo with a foreword by Carine Roitfeld. Helping to celebrate as well as buying Mazzucco's displayed pics of people like Adriana Lima: Julia Restoin Roitfeld, Lauren Santo Domingo, Brittny Gastineau, and many others. [GoaG]