1. Read your invitation carefully
In Poland it is quite possible to be invited to the wedding but not the wedding party. In fact it’s more common to be invited to the ceremony than to the party. I once bumped into an English friend of mine dressed up in his finest and white-faced with shock.
Officers at Embassies and Consulates do not have the authority to perform marriages for their own nationals.
Belgian law only recognises the validity of a civil ceremony for both heterosexual and homosexual couples. A couple may choose to follow the civil service with a religious ceremony if they wish but it will have no legal significance. Some religious establishments only permit marriage ceremonies between heterosexual couples. The only authority with the power to celebrate a legal marriage is the office of the state via the local municipality
Civil marriages take place at the Town Hall in the presence of two witnesses. At certain times and on certain days no charge is made for this service. On completion of the civil ceremony the marriage is recorded in the register of civil status at the town hall and the newly-weds are issued with a marriage booklet. This acts as the legal proof of their status as a married couple.
Non-Belgians marrying a Belgian citizen do not automatically become Belgian nationals themselves, although they can apply for Belgian nationality following the marriage.