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Sunrise is the epitome of a romantic silent film, or any film for that matter. The texture of the film, the lighting, the close-ups of the characters, storyline... I wouldn't recommend any other film for what you're looking for.

I may be too late in posting this...

but I urge you NOT to show Sunrise through the wedding. The film would only sporadically or in bursts be taken in by the audience. It would not be doing the film justice.

If I may suggest, and this may be more difficult, attempt to get one of the music scores of the film, and have that play at one point in the wedding...