Hello Sosheila, I checked Knowledgebase and found BB120344 , which says that this has been filed as a suggestion, but that you can link existing gifts to events using a registration fee import. In Knowledgebase, you can submit feedback on this solution so that we can better understand how this functionality...

Hey, I've been asked by the DoD to, when I'm creating mailing lists for event invitations, or mailings, to mark on constituent records that this constituent received this mailing. When creating the mailing list, I often pull names based on gift records, or constituency code, but then add names...

Melissa is right on. If you have access to Config, you can go to Fields, Participant and unmark the Required checkbox in the Participation row. After the import, you can make it a required field again. This information is also in Knowledgebase (BB450434): Error: Required field missing: Participation...