Here are prominent Mumbai hotels that offer private event / banquet / wedding / meeting facilities (with typical capacities and standout features). I’ve linked each item to the hotel’s official event/meetings page so you can check floor plans, availability and contact the events team directly.

• Taj Mahal Palace (Colaba) — grand ballroom, several private dining and rooftop venues; largest indoor ballroom ~495–687 sq.m (ballroom/crystal room) with capacities up to ~400–550 for large functions; multiple smaller private rooms and rooftop options for 50–150 guests. (tajhotels.com)

• The Oberoi, Mumbai (Nariman Point) — two elegant function suites / meeting rooms with ocean views suitable for small-to-medium private receptions and business meetings (private events typically up to ~50 guests per suite). Known for discreet, high‑touch service. (oberoihotels.com)

• The Leela Mumbai (near airport / Andheri East) — large range of ballrooms and meeting rooms; Grand Ballroom and multiple divisible ballrooms with theatre/banquet capacities into the hundreds (e.g., Grand Ballroom ~700 theatre / ~1,100 reception). Good for large corporate events and weddings. (theleela.com)

• ITC Maratha, a Luxury Collection (Andheri East) — pillarless ballroom (≈685 sq.m) for up to ~600 (reception) and extensive outdoor Royal Gardens for very large weddings (reported up to ~1,200–1,500); offers “green banquet” options. (itchotels.com)

• JW Marriott Mumbai Sahar (near airport / Andheri East) — multiple meeting rooms and large Grand Ballroom; total event space ~2,456 sq.m and largest indoor capacity around 900–1,000 (depending on setup). Strong AV & MICE support. (marriott.com)

• The St. Regis Mumbai (Lower Parel) — Astor Ballroom and several event rooms; large ballroom capacity up to ~1,000 (or ~700–900 depending on layout) plus terraces and private rooms for smaller events; full AV and event-planning services. (marriott.com)

• Grand Hyatt Mumbai (Bandra Kurla Complex, BKC) — extensive meeting inventory, Grand Ballroom (very large: up to ~1,500 theatre; lawns for thousands), multiple salons and large lawns—suitable for conferences, product launches and weddings. (cvent.com)

• Trident, Nariman Point — multiple meeting rooms and banquet halls (Regal Room, Sunset Lounge etc.); can host events up to ~700–750 guests depending on configuration; good ocean‑view venues. (tridenthotels.com)

• Sahara Star (near airport) — very large pillarless Sapphire/Ruby/Jade ballrooms (Sapphire/Jade reported as among the largest pillar-less in Mumbai); capacities reported into the thousands for big galas and exhibitions. (saharastar.com)

• Hilton Mumbai International Airport (Andheri East) — several banquet halls including a pillar‑less ballroom (largest ~320–350 banquet) plus a garden terrace; convenient for airport‑adjacent events and smaller conferences. (hilton.com)

Quick planning checklist (to use when contacting the hotel events team)

• Final guest count (or range) — this determines which halls are suitable.
• Date(s) and flexibility — weekend/season rates and availability change quickly.
• Format: banquet, theatre, boardroom, cocktail, outdoor lawn, product launch, etc.
• AV needs (stage, screens, lighting, internet) and decorator rules.
• Catering preferences (in‑house, menu types, alcohol policy) and minimum spends.
• Overnight rooms needed (room blocks / group rates) and transport/parking.
• Permits, load-in access, vendor restrictions for external vendors.

How to proceed

• Open the hotel events page (citations above) and use the “Enquire”, “Plan your event” or events contact form — hotel events teams typically respond with capacity charts, sample menus, and pricing. For very large or complex events, request a site visit and a written proposal/contract.

If you’d like, I can:

• Narrow this list (by neighbourhood: South Mumbai / BKC / Airport / Lower Parel), by capacity (e.g., under 100, 100–500, 500+), or by budget level; or
• Draft a short enquiry email you can send to 3–5 hotels with your event details (date, guest count, budget, AV needs).