Hello @AZC3 ,
The RSVP buttons are associated with the contact originally sent to, so no you can't RSVP for someone like as an event. Even if the contact forwards the email, the RSVP will still be linked to the original contact that received it, meaning forwardees' clicks will reflect for that contact.
If you're needing to manually mark someone as interested in your RSVP, I'd advise exporting your email's RSVP report, and manually adding that contact to the CSV file.
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