If we mention the purpose of a movement before we mention the destination we usually use at before the place. Therefore you can use both depending on how the sentence is structured. The two sentences below would both be correct.
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sperkinsHi Bernice,NO! Do not put "to"
Just to be crystal clear, here is the exact layout used,
Mr and Mrs A Smith
request the pleasure of the company of
James and Emily
at an evening reception to celebrate the marriage of their daughter
Karen
to
Mr Mark Brown
at Leeds Castle, etc etc