Your kids love swinging for the fences any chance they get. Knock one out of the park with today's deal from Big League Wiffle Ball: Pay $7 (regularly $20) for admission for one kid or $9 (regularly $25) for admission for one adult to Family Fun Wiffle Ball Day at the Boston Common on Sunday, July 22. From 9 to 11:30 a.m., kids, ages 6 to 17, and adults enjoy a day of Wiffle ball themed events -- including instruction and gameplay. Compete against other local families or create your own grownup team. Big League Wiffle Ball dedicates a portion of its profits to The Jimmy Fund, which supports cancer research and care too -- so pick up that yellow bat and show your brood that Wiffle ball is no longer just a game for kids. Want more? Check out Big League Wiffle Ball on Facebook.