Here are major Colombo hotels that advertise both an executive/club lounge and meeting/event facilities (common choices for business travel). I’ve listed each hotel with a source showing lounge access and meeting rooms:

• Hilton Colombo — has an Executive Lounge for executive-floor guests and multiple meeting rooms/large ballroom for events. (Hilton.com)
• Cinnamon Lakeside Colombo — offers an Executive/Club Lounge for executive rooms and on‑site meeting rooms/business centre. (zetatours.com)
• Cinnamon Grand Colombo — Executive/Club level with lounge benefits and access to private meeting rooms and event facilities. (cinnamonhotels.com)
• Taj Samudra Colombo — Taj Club (club lounge) for club/executive guests and multiple meeting rooms/conference spaces. (qantas.com)
• Shangri‑La Colombo — offers club/executive lounge (club/club-level room types) and meeting/banqueting facilities. (lastminute.com)
• NH Collection Colombo (formerly Mövenpick) — has members/executive lounges and meeting/conference facilities (hotel rebrand info and lounge description). (en.wikipedia.org)

Notes and tips:

• Lounge access is normally limited to guests in Executive/Club rooms or certain suite categories; confirm inclusion when booking.
• Meeting-room availability, capacities, and any complimentary use for executive guests vary by hotel and often depend on booking class or membership — contact the hotel or check the hotel website for current meeting-room capacities, rates, and any executive-guest benefits.
• If you want, I can: (a) compare meeting-room capacities and typical rates for a specific date; (b) add other Colombo hotels with executive lounges (e.g., some five‑star properties may offer club floors on request); or (c) provide direct contact links and phone numbers for any of the hotels above.