Invite the whole group, with the right access for each. Owners and editors shape the plan, viewers follow along, and guests can join with just a name before they ever create an account.
Owner, editor, viewer
Give each member the access they need, from full control to read-only.
Add guests by name
Include travellers who have no account yet, just to split costs or list them.
Guests can claim a seat
A guest later links to a real account and keeps their history.