Response: Hello Mimi, How you word the invitation will be determined by the circumstances. If the reception follows your wedding ceremony, the invitation would say 'cocktail reception following the ceremony.' Then list the location if it is not the same as the ceremony location. You do not include the ending time.
If the reception will be held on a different day than the wedding, you would say something like, 'Sally Brown and John Black invite you to a cocktail party in celebration of their marriage,' then list the beginning time and the location and date.
Some of your guests will leave before 10 p.m. For those that stay, you signal the end of the party by your actions. If the party is not at your home, you would arrange to leave at 10 p.m. in some special manner, such as someone arriving with the car you will leave in. If you have a DJ or someone playing background music, they would stop playing at 10 p.m. or invite guests to have a last dance. Do what fits with the overall theme of the party.
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