it is not really necessary but it would be lovely.
Imagine looking back to your wedding years from now, through a guestbook and messages who wished you well.
For a guestbook suggestion: Have your picture framed with a big one, with lots of space around it, so the guests could sign their names on it.
And then you could just post the frame at home later. :-)
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wedding lasts a day, a marriage a lifetime, and love... eternally.