The invitation is to a wedding 2.5 hours away from where most guests live, and will require an overnight stay. The save the date went out months ago, and accommodation was booked. The invitations have now gone out to say that only the bride and groom's immediate family will be invited to the ceremony, and the rest of the guests are invited to join them for a party afterwards.
Would this bother you?
YABU - this is rude and guests should have been told earlier
YANBU - getting married is a personal experience and it's the party people care about attending