The sacrament of the wedding is the church consecration of the marriage union, which can be obtained after any experience of married life. The Orthodox Church, and most other Christian denominations, is rather lenient in the choice of the date of the wedding and the temple for the sacrament.
In the event that the bride and groom (or spouses, at the wedding some time after the conclusion of a civil marriage) belong to different denominations of Christianity, then in most cases either the transfer of one of the spouses to the church of the other is required, or a special permission from the ruling bishop is required. But this permission is issued in very rare cases. The sacrament of marriage provides for the unanimity of people who repeat their marriage vows before the altar after the priest.
It doesn't make much difference whether to get married in a small parish church or in a cathedral. But modern hierarchs of Orthodoxy say that in those cases when the bride and groom are truly deeply religious people and attend church, then for the wedding it is better to choose the church to which the young are used to constantly attending services.
It is customary for future spouses to choose the church that the bride is used to visiting for the sacrament of the wedding, but this moment is not fundamental. It's just that the bride and groom and their relatives must come to a common agreement and not start family life with squabbles and quarrels.
In cases where one of the future spouses was not baptized earlier, professes a different religion, different from the numerous denominations of Christianity, or denies the existence of divine power in general, then in this case not a single Christian church will agree to consecrate such a marriage union. It is necessary first to come to an agreement between the bride and groom on matters of faith and only after that decide on such an important step, which is the church performance of the sacrament of marriage.
The choice of a specific wedding date must be agreed in advance with the temple that was chosen for this, because the sacrament can be performed far from every day of the civil calendar year. Church and civil calendars have significant differences, explaining the impossibility of getting married every day. Therefore, it is better to agree on a date in advance and talk to the priest who will perform the ceremony.