What happens at weddings in russia? Use modal verbs and expressions

The ceremony in Russia  must be held at the registrar's office.
The bride and the groom have to wear special festive clothes: a white dress and a dark suit.
All the guests have to bring flowers for the bride and the groom.
Food and drinks for the reception have to be ordered beforehand.
Presents from guests have to be valuable.
The reception can be held at a restaurant.
Singers or special bands have to be invited to sing songs and play music.
Not all the guests have to make speeches. This can be done by relatives and very close friends if they wish.