Does it have to be even to get a marriage certificate?

Hehe, my friend, you misunderstood. It doesn't matter much whether the marriage registration is single or double!

China people choose to get married on auspicious days of the zodiac, and pay attention to avoid the three seven nine. It is best to avoid the three auspicious days of March, July and September of the lunar calendar, because these three months coincide with Qingming, Yulan and Chonggong respectively, which are traditional ghost festivals and are not suitable for joint happy events.

Second, pay attention to avoid the evil spirits of Sanniang. According to legend, Yue Lao didn't give Sanniang a red line, so that she couldn't get married. Based on revenge, Sanniang likes to go against the old lady and ruin the wedding of the couple, so the third, seventh, thirteenth, eighteenth, twenty-second and twenty-seventh days of each month are not suitable for marriage.

Third, don't choose your parents' birthdays. In traditional habits, parents' birthdays should not be the same as wedding auspicious days. In fact, it just means that it is not appropriate to get married on the exact date of parents' birthdays, but it is absolutely appropriate to get married within that month.