Here are well-known hotels in Singapore that offer private event-hosting facilities (ballrooms, meeting rooms, private dining, villas/lawns, rooftop & resort venues). I’ve listed the type of private spaces and typical largest capacities where available — please contact the hotel events team for exact availability and current rates.

Large / convention-capable hotels

• Marina Bay Sands — extensive MICE facilities (Sands Expo & Convention Centre), many ballrooms including the Sands Grand Ballroom (up to ~8,000 reception / ~6,000 banquet depending on configuration). (marinabaysands.com)
• Fairmont Singapore / Swissôtel The Stamford (Raffles City) — multiple large ballrooms including the Fairmont Ballroom (column-free, up to ~2,850–3,000 theatre/cocktail capacity) and many meeting rooms. (fairmont.com)
• JW Marriott Singapore South Beach — heritage Grand Ballroom plus multiple indoor/outdoor event spaces; ballroom capacity ~280–420 (depends on layout). (marriott.com)

Luxury city and resort hotels (for gala dinners, private dining, weddings, villas)

• Capella Singapore (Sentosa) — resort-style private venues, glass‑dome circular Grand Ballroom (banquet ~400, cocktail up to ~700), plus villas, lawns and pool-side options. (cvent.com)
• Raffles Hotel Singapore — historic private rooms and restored ballrooms (Jubilee/Palm ballrooms), private dining rooms and The Lawn for garden events (intimate to mid-size). (rafflessingapore.com)
• The Ritz‑Carlton, Millenia Singapore — pillar-less Grand Ballroom (largest ~1,400 theatre / ~1,000 banquet) plus garden pavilion, pool deck and private pavilions. (ritzcarlton.com)
• Shangri‑La Singapore — large Island and Tower ballrooms, extensive meeting rooms and outdoor lawns; Island Ballroom handles up to ~1,000 (banquet/cocktail varies by layout). (shangri-la.com)
• The Fullerton Hotel Singapore — heritage ballrooms and private dining rooms; The Ballroom and Straits Room suit weddings, dinners and private receptions (ballroom capacities vary, often a few hundred). (cvent.com)
• The St. Regis Singapore — John Jacob Ballroom and Caroline’s Mansion (private driveway/estate-style events); ballroom capacity up to ~400–600 depending on layout. (marriott.com)

Design-forward / boutique & resort alternatives (unique private spaces)

• Andaz Singapore (Duo/Fraser Street) — flexible “Alley on 3” event floor with studios, garden terrace and a jewel-box ballroom; suitable for private dinners, product launches and medium-to-large events. (visitsingapore.com.cn)
• W Singapore – Sentosa Cove — Great Room, studios and outdoor W Lawn for private parties and cocktail events (resort-style, terraces and poolside options). (marriott.com)
• PARKROYAL COLLECTION Pickering — pillar-less ballroom plus green terrace and function rooms (eco-conscious packages; up to ~300–400 delegates when combined). (visitsingapore.com.cn)

Notes and next steps

• Capacities and layouts vary by setup (banquet vs theatre vs cocktail) and can change; always confirm the exact room dimensions, ceiling height, AV capabilities and guest limits with the hotel’s events team before booking.
• If you tell me (a) type of event (wedding, corporate dinner, product launch, meeting), (b) expected guest count, (c) preferred area (Marina Bay / Orchard / Sentosa / CBD), and (d) budget or style (luxury, boutique, resort), I can narrow this to the best few options and include direct event‑team contacts or sample package info.

Would you like a shortlist based on event type, guest count and location?