Is it Sunnah for a married couple to delay the 'Isha prayer on their wedding night until they pray together upon entering?

There is no evidence that it is from the Sunnah for a husband and wife to delay the 'Isha prayer on their wedding night to pray it together. Rather, it is prescribed for them to pray two rak'ahs together on that night, as has been reported from some of the Salaf.