I know it’s the brother’s right when he invites you to a wedding that you accept the invitation and go to the wedding party.
Now this is the case: The husband of a woman has died last week. May Allah forgive him and grant him Paradise. Next week the woman’s sister is having a nikaah party for her daughter. Knowing that the woman is still in her iddah, is she allowed to go to the wedding party? What about joining the party for a few hours? Is she allowed or does she have to stay in her house during the iddah?
No, she is not allowed to attend. She has to stay in her home during the iddah.