That's because of today's date thousands of couples have waited to get married. The one common of today is it's date when 11.12.13 fall in sequence. That may be their reason but the numbers fall in order and therefore they consider it's a good omen for a date of marriage. Today many couples get married also to help remember their very first anniversary just in case they may forget the date. However, many will get married today because they truly have made a vow to love each everyday of their married life.
The next similar date like this one will be 12.13.14.