COACH PLAYS DEFENSE: Coach will host its third annual cocktail and shopping event at J.J. Abrams’ studio Bad Robot on April 10. Hosted by Abrams, his wife Katie McGrath and producer Bryan Burk, the evening benefits the Children’s Defense Fund, a nonprofit child advocacy organization. Celebrity DJ Tendaji Lathan (brother of actress Sanaa Lathan) will man the turntables along with Katy Perry’s stylist, Johnny Wujek. In support of the cause, Coach will sell its Bleecker canvas beach tote and Legacy two-tone Universal clutch and donate 100 percent of the profits to CFD. The bags will be available in stores nationwide in May.