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If you are inviting orally or informally,
"You are invited at wedding of ABC and CDE on 'the date' at the location."
If you are sending out a formal invitation,
"Your presence is requested at the wedding ceremony of ABC and CDE to witness and celebrate their nuptial on 'the date' at 'the location'."
If there is a reception (small party) afterward, add the following.
"A reception will follow the ceremony at 'the location'."
If they are invited to the banquet as well, add the following.
"A banquet will be held at the 'restaurant' at 'the time'."
If they are required to tell you whether they are coming or not, add the following.
"RSVP" meaning 'Let me know whether you are coming or not'