Step 1 is to work out who is really needed at the meeting - use an outline agenda as a guide, and take advice from colleagues
Step 2 is to try to find a date/time and venue when all the right people can attend. If this seems too far in the future, you may need to get creative: consider splitting the meeting so the right people can attend the relevant session; consider a time outside normal hours; or call on someone more senior to insist on attendance.