In Bombay around 7 - 8 ijtemas are held every week. Some of them take place on Thurs and some on Sat.
Thurs
Madina Masjid
25 Shivaji Nagar
Govandi
Mumbai
Bandra Station Masjid
Bandra West
Mumbai
Sat
Shafi Masjid
Bhendi Bazaar
Mumbai
I will get the exact info and post it soon Insha Allah