If a Hathan, a bridegroom, finds that one of the fast days, such as the seventeenth of Tammuz, Som Gedalia, the tenth of Tebeth, or Ta'anith Esther falls during his seven days of celebration, what should he do?
There are those who say that he should fast, and then fast again after the seven days as a makeup fast for that, and others who say that he should not fast. In Ben Ish Hai it says that their custom was not to fast.
In any case, if the anniversary (yahrseith), of the passing of one of his parents falls during that week, he should not fast according to everybody, because this is a yom tob for him.
(See Ben Ish Hai, Shana Aleph, Parashath Shoftim, Oth Yod Heth)
See what people are 
