You can arrive too early. Or you can be late and miss aspects of the marriage ceremony that were meticulously planned for the benefit of guests. At weddings, both are faux pas.
When you show up well before the appointed time, you'll likely arrive without the finishing touches in place. This could end up rushing things along and stressing out the couple and their families. The bride may still need to get dressed, and things could get awkward.
It's also impolite to leave too early.

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