* How to top a successful White House recipe challenge for kids? Have another one. Epicurious and first lady Michelle Obama are teaming up for the second Healthy Lunchtime Challenge & Kids' "State Dinner." Kids ages 8-12 and their parents or guardians can submit an original lunch recipe through May 12 (recipechallenge.epicurious.com, or mail to "The Healthy Lunchtime Challenge c/o Epicurious.com," 1166 Avenue of the Americas, 15th floor, New York, NY 10036). Winners get lunch at the White House with Mrs. Obama.
* Guerrilla Ultima Truck master Robert Legget stirs up some delicious trouble Sunday as guest chef at Dock Street Brewery (701 S. 50th St., 215-726-2337, dockstreetbeer.com) for beer cocktails and a Cinco de Mayo-inspired brunch. Kitchen opens at 11:30 a.m. Come early - the fun stops when the food's gone.
* Busy days at Greensgrow Farms in Kensington. Saturday, White Dog Cafe founder Judy Wicks signs copies of her book, Good Morning Beautiful Business, from 12:30-4:30 p.m. at the farm (2501 E. Cumberland St., 215-427-2702, greensgrow.org). Plan now to attend Marisa McClellan's Strawberry Mint Jam Workshop, noon-2 p.m. May 18 at Greensgrow Community Kitchen in St. Michael's Lutheran Church (2139 E. Cumberland St., 267-283-6787). $35.