How does IDDAT affect a widow’s ability to attend her sister-in-law’s Nikah and Valima?

Can a widow observing IDDAT attend the Nikah and Valima of her Sister in Law? Please elaborate. Jazakallah!

بسم الله الرحمن الرحيم

(Fatwa: 1268/1082=L/1429)

During iddah, a widow can not go out of her house for participating in nikah or valima of her sister in law.

Allah knows Best!

Darul Ifta,
Darul Uloom Deoband

This answer was collected from the official ifta website of Darul Uloom Deoband in India.

Link