Former New England Patriots tight end Rob Gronkowski, in partnership with The Jimmy Fund, is organizing Pickleball for a Purpose. Participants can register as individuals or teams on www.jimmyfund.org/gronk and unlock prizes based on fundraising levels, including the opportunity to play pickleball with Gronk and signed merchandise giveaways. Spectators can also attend the event by donating at https://charity.pledgeit.org/pickleball, with limited tickets available for the May 28 event at Bosse in Natick from 5 p.m. to 8 p.m.