What is the ruling on attending a wedding feast without an invitation?

It is forbidden to attend a wedding feast without an invitation, unless with the permission of the host, or if their consent is known from their usual behavior, based on the Almighty’s saying: ﴿O you who have believed, do not enter the Prophet's houses except when you are permitted for a meal, without awaiting its preparation. But when you are invited, then enter…﴾ [Al-Ahzab/53]. An exception to this is if the uninvited person is an attendant of an invited person of status, or if the host’s consent to their presence is known due to friendship or kinship between them, or if it is customary that the host permits every attendee.