Hi @Ashley04021!
In this case, I’d add them to the event itself on your calendar (Google Calendar, Outlook, etc.) just like you’d create/modify an event normally. The reason for this is that the Calendly event sounds like a 1:1 and therefore can’t accept any other invitees - but your calendar invite can!
The only important thing to keep in mind is that the other 6 people will not receive an automated communication such as reminders, follow up, etc. through Calendly so you’ll likely want to set a reminder to do that manually just for this event.
In the future, sounds like a group event would be the right fit for this type of situation. Or you could even consider using a meeting poll to find the right time across the whole group.
Hope this helps!