about 1,500 km from Sultanpur
Pandit for Katha, Griha Pravesh and Puja in Mumbai
Mumbai is the furthest of these, a flight or a full day and night by train, so the dates are blocked in one stretch and settled further ahead than anywhere else — a month or more before the occasion rather than a fortnight.
The constraint in Mumbai is almost never the vidhi — it is the room. A havan in a flat needs the building's permission and a plan for the smoke, a Vyas Peeth needs a clear wall and floor space a two-bedroom flat may not have, and a society hall has to be booked for the same days the panchang allows. From June to September the monsoon rules out anything arranged in the open, so those months are planned indoors from the start.
Send a photograph of the room along with the dates, and ask early — at this distance a date that suits both sides is the scarce thing, not the vidhi.
Commonly arranged in Mumbai

Shrimad Bhagwat Katha
A weekly or seven-day Shrimad Bhagwat Katha — at home, in a temple or in a community hall, as prescribed by the Shastras.

Navgraha and Graha Shanti Puja
Navgraha Shanti, Graha Shanti Puja and Mangal Dosh Shanti Puja — performed as per the Shastras, with mantra-jaap.

Janam Kundli and Astrological Consultation
Preparation of the Janam Kundli, its astrological study and guidance related to the planets.