Thank-yous close the guest loop. They confirm you received the gift, that their presence mattered, and that they are not forgotten once the honeymoon starts.
Recommended window: 4 to 12 weeks after you return. Past 3 months, a late note still beats silence.
Who to thank first
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Guests who gave a gift (personalize when possible)
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Witnesses and close helpers (speeches, DIY, logistics)
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Non-contract vendors who went extra (volunteer officiant, host)
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Parents and in-laws, even without a material gift