Here are popular venue types and specific places companies commonly use to host corporate events in Colombo, with a short note on what each suits best and sources you can contact for details.

Large convention / exhibition centres (for conferences, trade shows, large annual dinners)

• Bandaranaike Memorial International Conference Hall (BMICH) — large plenary halls, trade-show space and breakout rooms. Good for conferences and exhibitions. (Anantara.com)
• Sri Lanka Exhibition & Convention Centre (SLECC) / Water’s Edge complex — large halls and outdoor lawns for big corporate functions and exhibitions. (linkedin.com)

Hotel ballrooms and meeting-centre packages (widely used for conferences, seminars, product launches, dinners)

• Cinnamon Grand / Cinnamon Lakeside — multiple ballrooms and meeting rooms with full AV and catering. Good for banquets and conferences. (timeout.com)
• Shangri‑La, Colombo and The Kingsbury / Galle Face Hotel — premium hotels with large ballrooms and corporate event teams. Ideal for executive dinners and large meetings. (world.nh-hotels.com)
• Hilton Colombo, NH Collection Colombo — centrally located hotels with meeting rooms and mid-to-large capacities (NH Collection’s Mont Blanc room seats ~200 theatre). (world.nh-hotels.com)

Dedicated banquet halls & event venues (flexible layouts, mid-to-large guest lists)

• Serendib Grand — multiple banquet halls (Pearl/Crystal/Opal) for corporate events up to several hundred. (timeout.com)
• Raffles / Raffles Residence and similar banquet operators — private banquet halls for 100–300 guests and tailored catering. (ten.lk)
• Wave n’ Lake / other large standalone banquet halls (suitable for large annual dinners/awards). (linkedin.com)

Smaller meeting rooms, clubs & business centres (workshops, board meetings, training)

• Colombo Swimming Club meeting rooms — small professional rooms suited to board meetings, training sessions (up to ~25). (colomboswimmingclub.org)
• City hotels (Renuka City Hotel, Renuka and similar) — multiple small-to-medium meeting rooms and conference packages. (renukacityhotel.com)

Resorts & offsite retreat locations (team-building, overnight retreats)

• Anantara Kalutara and coastal resorts near Colombo — ideal for offsite retreats, beachfront team activities and multi-day conferences. (About 1 hour from Colombo.) (corpvenue.com)

Other options

• Co‑working & event spaces (for launches, networking, smaller seminars) — Colombo has multiple private event spaces and co‑working operators that rent rooms by the hour/day (search locally for “Colombo event space hire” for current listings).
• Outdoor lawns & cultural venues (e.g., Nelum Pokuna Mahinda Rajapaksa Theatre for performing-arts-style events) — useful if you need a theatre setup or scenic outdoor space.

How to choose and next steps

• Pick by capacity (theatre/banquet/classroom), AV needs (live streaming, mics, staging), catering policy, location/parking, and budget.
• If you want, I can: (a) shortlist venues for a specific date/guest count/budget, (b) pull up contact pages and recent capacity charts for 3–5 venues you prefer, or (c) draft an RFP/email to send to venues. Which would you like?