A friend from university, who I didn’t intend to invite, and who won’t get along with my other friends, sent me a present. How should I respond?
Do not consider the gift an invitation for an invitation. Rather, think of it as a message that you and your fiancé are important to this person. Respond with a “thank you” card.
Consider the circumstances. Does your friend realize that he/she may not be invited? What news about the guest list has been disseminated already? You are not obligated to invite this person, but if you decide to, the invitation should go out right away, if the others were sent already.