Mourning - Participation in a Shalom Zachar and a Brit

A. Is a mourner permitted to participate in the Shalom Zachar of his grandson, when the father of the baby is young and the Shalom Zachar is being held in the home of the grandfather who is a mourner, or in the synagogue where the grandfather prays? And what is the law if the Shalom Zachar is held in the mourner’s home?
B. Is a mourner permitted to participate in the brit of his grandson and remain there for the entire event?
C. Is it permitted to give a mourner honors at the brit?

Shalom u’vrachah 

A. When the Shalom Zachar is in the mourner’s home, it is certainly permitted. And when it is not in his home, if his absence would be noticeable—for example, if it is held in the synagogue where he prays or in a place where his absence would be noticeable—it is permitted. 

B. It is permitted, since it is customary for the grandfather to participate, and his absence would be noticeable. 

C. It is permitted even when his absence would not be noticeable, since the issue is only participation in the meal, and not in the mitzvah itself. 

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