Great — here are top hotels in Colombo that are well suited for seminars, conferences, product launches and other MICE events, with quick notes on capacities / standout venues so you can shortlist fast.

1. Shangri‑La Hotel, Colombo — for very large launches and ballroom events

• Standout: pillar‑less Shangri‑La Ballroom (approx. 1,580 sqm) with theatre capacity into the thousands; multiple ballrooms, breakout rooms and outdoor lawn options. Ideal for large product launches and regional conferences. (Shangri-La.com)

2. Taj Samudra, Colombo — seafront, flexible ballrooms + lawns

• Standout: several ballrooms and large lawns; Samudra and Grand Crystal ballrooms (theatres and banquet layouts up to ~200–350 depending on room); lawns that can host up to ~2,000 for outdoor events. Good for premium launches with ocean views. (tajhotels.com)

3. ITC Royal Bengal / ITC Ratnadipa (Marriott Luxury Collection) — large, upscale event spaces

• Standout: large Sangam/ballroom spaces and panorama deck options; extensive meeting square footage and modern AV support — suitable for high‑end seminars and gala launch dinners. (Hotel event pages list capacities and floorplans). (marriott.com)

4. The Kingsbury Colombo — large ballrooms with harbour views

• Standout: Balmoral Ballroom (~7,725 sq ft / capacity up to ~500 reception / large theatre layouts) plus several smaller flexible rooms — strong choice for gala launches and trade presentations. (discovercolombo.com)

5. Cinnamon Grand Colombo — established MICE hotel in city centre

• Standout: multiple ballrooms and meeting rooms, professional events team and full on‑site catering; popular for corporate seminars and product launches (see hotel event/meetings pages for room‑by‑room capacities). (marriott.com)

6. Cinnamon Lakeside Colombo — riverside location, large banquet halls

• Standout: big ballrooms and meeting suites, modern AV and good for ICT/product demos or multi‑room events. (Hotel events pages list capacities and setups.) (marriott.com)

7. Galle Face Hotel — historic seafront venue with character

• Standout: classic colonial ambience, Grand and Jubilee ballrooms (Grand Ballroom ~250–280 pax; Jubilee ~150–200) — great when you want heritage charm for a launch or intimate seminar. (gallefacehotel.com)

How to pick (quick checklist)

• Audience size: choose a ballroom with at least 10–20% extra capacity for staging, demo space and pre‑function flow. (Shangri‑La and some ITC/Kingsbury spaces are best for 500+.)
• AV & staging: confirm in‑house AV capability (LED screens, rigging, interpretation if needed).
• Location & accessibility: city‑centre seafront hotels (Taj, Shangri‑La, Galle Face) are convenient for media and guests.
• Food & catering: check sample menus, themed coffee breaks and ability to handle F&B for product demos.
• Outdoor options: useful for product unveilings, photo ops and cocktail receptions (Shangri‑La, Taj, Galle Face have lawns/terraces).
• Budget & brand fit: upscale brands (Shangri‑La, Taj, ITC) for premium launches; Cinnamon properties for strong value and service.

Next steps (recommended)

• Shortlist 2–3 hotels from above based on expected guest count and vibe.
• Request an RFP / dates and ask for: detailed floorplans, AV spec sheet, sample F&B menus, preferred vendor rules, and a site visit (or a virtual walkthrough).
• If you want, tell me the expected guest count, preferred dates, and whether you need outdoor space or heavy AV/staging — I can draft an email/RFP template and recommend the best 2–3 fits.

If you want direct contact links, I can fetch the hotels’ event contact pages and attach the RFP template.