Dear @Eileen Donoghue,
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, you wonder can you create bookings that more than one person can join.
For better understanding your situation, could you please confirm for me some information as:
Which type of Booking are you using? Personal Booking or Shared Booking Pages (Business Booking)?
In the meantime, I assume you're using Shared Booking Pages, here is suggestion to create Booking with more than one person can join:
Click to your Share Booking Pages > Services > In your current Booking > choose edit service, in there you can choose number of attendees who can join.
I hope information above meet your expectation, if it does not, please update more detail information so I can support you more effectively.
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