Here are major Colombo hotels with large event / MICE (meetings, incentives, conferences, exhibitions) spaces — each line shows the hotel, its biggest function space(s) and typical maximum capacities or special features (with source links):

• Shangri‑La, Colombo — Shangri‑La Ballroom (total ~1,580 m²) with theatre/reception capacity up to ~3,000 reception / ~2,500 theatre; multiple divisible ballrooms plus an outdoor lawn (up to ~420 dinner / ~750 cocktail). (shangri-la.com)

• Cinnamon Life (City of Dreams Colombo) — Lumina Ballroom (largest) — theatre up to ~1,556 delegates (divisible) and multiple large pre‑function and outdoor options; positioned as one of Colombo’s largest hotel event complexes. (cvent.com)

• Hilton Colombo / Hilton Colombo Residences — pillar‑free Grand/Union Ballroom options; largest setups ~1,000–1,100 theatre / several hundred banquet (largest room footprints ~1,100–1,124 m²). (hilton.com)

• Taj Samudra, Colombo — multiple ballrooms and large landscaped lawns; lawns and outdoor spaces can host up to ~2,000 guests; several indoor ballrooms (200‑seated mid‑size options and larger rooftop Samudra Ballroom). (tajhotels.com)

• Cinnamon Grand Colombo — Oak Room (main ballroom) and Atrium plus several meeting rooms; Oak Room / Oak Room + foyer listings show theatre capacity up to ~750–900 and large banquet configurations. (cvent.com)

• Cinnamon Lakeside Colombo — King’s Court (master ballroom ~6,500 sq.ft) and several large venues; King’s Court banquet up to ~400 and theatre up to ~600; plus lakeside outdoor/marquee options. (cinnamonhotels.azurewebsites.net)

• The Kingsbury Colombo — Balmoral Ballroom ~676 m² (≈7,725 sq.ft) with banquet capacity reported up to ~500; large lawns and multiple function rooms. (thekingsburyhotel.com)

• Galle Face Hotel — several large heritage ballrooms and the Chequerboard outdoor area; Chequerboard / lawns can handle up to ~1,000 for sundown events; Grand/Jubilee ballrooms for 150–320 depending on layout. (gallefacehotel.com)

• Mövenpick Hotel Colombo — multiple ballrooms (e.g., Mont Blanc ~200 sqm / ~200 guests and Monte Rosa ~1,378 sq.ft for ~80+), plus several meeting rooms and terrace/breakout areas. (business-standard.com)

• Sheraton Colombo / Courtyard by Marriott (near Fort area) — Sheraton: several meeting rooms with largest space ~250 pax; Courtyard by Marriott: total event space ~917 m² with largest room up to ~300. Good options for mid‑large conferences. (marriott.com)

Notes and next steps

• Capacities depend on layout (banquet vs theatre vs cocktail) and whether foyer/outdoor space is included; the numbers above are taken from the hotels’ event pages and venue charts. (shangri-la.com)
• If you tell me the expected guest count, preferred area (oceanfront / city center / near Fort), and approximate date, I can shortlist the best 2–3 hotels and pull current availability, floor plans and contact details or request proposals on your behalf.