Congregational prayer

When Should People Stand for Congregational Prayer?

Dear scholars, As-Salamu `alaykum. During the iqamah (final call to prayer), when should people stand for jama`ah (congregational prayer)? Should they stand when the muezzin says “Hayya `ala as-Salah”? Please explain the Islamic teaching regarding this issue. Jazakum Allah khayran.

Holding a Second Jama`ah in the Same Mosque

Scholars of Islam, as-Salamu `alaykum. I want to ask whether another Jama`ah can take place in a mosque when the regular scheduled Jama`ah has already been over for the same prayer?