Hello @FCCT. You would be able to have the parent sign their children up as guests for an event (or in your case, a field trip). The guests are counted towards the registration limit, along with the main registrant which would be the parent. We do not have a way to not make the parent count towards the registration limit, unfortunately.
If you were to have the parent sign up each child individually, you would have to have separate email addresses for each child, so I think counting them as "guests" would work the best. Let us know if you need any more assistance with creating an event
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