Hard and fast rule: If the wedding is 8 pm or after, wear a tuxedo even if the invitation doesn’t suggest so. If the wedding is at 7 pm-ish, use your best judgment. Lastly, if the invitation indicates ‘Black Tie Optional’ always wear a tuxedo. In this situation, you cannot overdress. For afternoon weddings and early evening summer weddings consider leaving the tuxedo behind.Hard and fast rule: If the wedding is 8 pm or after, wear a tuxedo even if the invitation doesn’t suggest so. If the wedding is at 7 pm-ish, use your best judgment. Lastly, if the invitation indicates ‘Black Tie Optional’ always wear a tuxedo. In this situation, you cannot overdress. For afternoon weddings and early evening summer weddings consider leaving the tuxedo behind.