We have kids activity event that runs for a year, for example, event name is KIDS CLUB - 2019. Registration is done by webform. We capture parent details as relationship and added to PARENT GROUP. Kids details added as contact & participant, added to KIDS GROUP. That was easy part!
For the next year we would need to create an event called KIDS CLUB - 2020. Some kids and parent may remain same and some new kids will signup. We do not want to send any related email to those parents who has not signed up for 2020.
How can we remove the parents & kids automatically that would not signup for next year? Perhaps some of you can think of an alternative approach to deal with it. Please feel free to suggest. Thanks