Participation in a Second Marriage Wedding During the Year of Mourning

Can a mourner within a year of his mother's passing attend a second marriage wedding if it is a small and limited event?

The law for a second marriage is the same as for a first marriage, as it is said at the meal that the joy is in His dwelling. However, in the case of remarrying a divorced wife, it is permissible to be lenient and allow participation within thirty days at home, like any meal where it is not said that the joy is in His dwelling.

Barkhi Yosef, Siman 391: "Returning a divorced wife is not a joy, and therefore it seems that it is permitted for the mourning homeowner to sit at the meal. It is already known that we do not follow the instructions of the Morah not to sit at any meal, but at any meal that is not a meal of joy, the mourner sits with them, and therefore there is room to permit the mourner within 30 days to sit at the meal of returning a divorced wife, according to our custom. And even if we are strict regarding returning a divorced wife, in our case, where he is the homeowner and there are no others, it is permitted. However, in the case of a widower and widow, even if it is like this case, it is obvious that it is forbidden, as it is called a meal of joy, and they bless at the meal that the joy is in His dwelling, and they do not marry on a festival. And behold, the Raavad only permitted within 12 months for an orphan and orphaness, so as not to cancel the marriage, but here he should wait until after thirty. And it is not permitted because it is in the house of mourning, as the marriage can be postponed [until after thirty]. And behold, the Maharshal, Siman 202, only permitted because of the distress of the groom [and] within 12 months. And it is simple." And even for Ashkenazim, it seems permissible to return a divorced wife when the meal is in his home, like any mitzvah meal where it is not said that the joy is in His dwelling.