Byzantine Catholics are mostly not as strict in their observance of the traditional marriage practices of the Eastern Church.
Here is something I found from an Orthodox website, but don't know their sources:
A. Couples should plan their weddings for seasons, times and days which are permitted by the Church for marriage. The most appropriate time for weddings is Sunday, after the Divine Liturgy.
Marriages are not to be celebrated on:
- the evenings before Wednesdays and Fridays throughout the year;
- on Saturday evenings throughout the year;
- the eves of the twelve Great Feasts, or patronal feasts of the parish;
- during the course of all the fasts (Great Fast, Apostles' Fast, Dormition Fast, Advent Fast);
- during the course of Cheesefare Week (from Sunday of Meatfare to the Sunday of Cheesefare);
- from the feast of the Nativity of the Lord (December 25) through the feast of the Synaxis of St. John the Baptist (January 7);
- on the day and the eve of the Beheading of St. John the Baptist (August 29) and the Elevation of the Cross (September 14).
2. Because marriages are normally not to be celebrated on Saturdays, requests for Saturday weddings require a petition in writing to the Bishop, by the rector, for the Bishop's consent.
- those Saturday weddings that are permitted will be celebrated no later than 11:00 a.m., with the reception to conclude well before the evening vigil services.
B. Marriages are to be celebrated in an Orthodox Church building, and not in halls, gardens, or other places.
Web source:
http://www.dneoca.org/articles/marriage.html