Chicago ? If one seven is lucky, three must be really lucky.

That’s the thinking behind the bonanza of weddings scheduled throughout the nation for Saturday, July 7, 2007 – or 07/07/07.

“Couples are definitely superstitious,” says Kathleen Murray, deputy editor of TheKnot.com, a wedding planning Web site. “I think they’re looking for a great fun date, and 7-7-7 is very lucky.”

Among the brides and grooms who have registered at the Web site, 655 couples are planning weddings on next July 7, compared to the 424 who have selected one of the other three Saturdays that month.

Of course, there are some dates that tend to be avoided. Take Friday the 13th. Well, actually, not a lot of grooms and brides do.

Among the 3,400 couples registered at TheKnot.com for next July, only 71 are planning to wed on the 13th, a Friday.