The invitation should make it clear. The inside envelope will say Christiangirl and guest or something to that effect. Every person who is invited, even if unnamed, should be listed. As a family, an invitation to my parents might have side "Dubaisis Family" or Dubaisis, DubaiMom, DubaiDad, Dubai Oldestsis, etc., all spelled out. Unless you are a family member or they know you have a bunch of mutual friends attending the wedding, it would be pretty rude to NOT allow you a +1.
As far as when the guest should invite the +1, if it's a long time SO, go ahead and RSVP early. The bride will appreciate it. If you are gonna have to go trolling for a date, I'd probably wait until fairly last minute so you don't end up with an embarrassing sitch of having to change your +1. But still, presuming you're good friends, you could advise the bride that you are definitely attending, but don't know yet about your +1. Waiting for those RSVPs to come in is freakishly stressful so anything you can do to let her know is a good thing.
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