Day Questions

I want to ask if it is permissible or suitable in the gatherings of the month of Muharram to serve food items that are used also during marriage parties or other happy occasions.

Serving food in Muharram is permissible, but one should refrain from overspending in the prohibited way. It is better to have such gatherings with sadness and grief that associate with Ashura, so it may correspond to the emphasis of the Imams of the Ahlulbait (peace be upon them) on expressing such feeling on these days.

If somebody is following a certain marja and he discovers that there is another marja who is at the same level of knowledge according to the view of members of ahl-ul-khibrah, can he choose between the two?

It is not permissible to change from the current marja unless it is proven by religious evidence that another mujtahid is more knowledgeable than him.

Was the revolt of Mukhtar bin Abu Ubaida as per the instructions of Imam Zain-ul-Abideen (peace be upon him)?

There is no historical text that states that Mukhtar began his revolution by the order of Imam Zain-ul-Abideen (peace be upon him). Yes, some narrations praised what Mukhtar did.