In Old English Folklore Saturday is believed to be the unluckiest wedding day. Funny—it’s the most popular day of the week to marry now! It’s important to find a day of the week and date that matters to you and your guests. Most of the time, Monday-Thursday is usually cheaper for venues, and other vendors used. Friday-Sunday is more popular to be booked which increases prices not only for wedding vendors, but also air fare and hotel rooms for guests.