Here are top hotel-based entertainment venues in Colombo (good for rooftop views, live music, DJs, cocktails or dancing). I’ve listed the venue, what it’s known for, and a source so you can check current hours/events and book directly.

• Sky Lounge — The Kingsbury (rooftop bar & lounge; cocktails, live music, panoramic city/port views at sunset). (thekingsburyhotel.com)
• Firebeach / King of the Mambo / Travellers’ Bar — Galle Face Hotel (beach-club style Firebeach, Cuban-themed King of the Mambo with dancing/nightly entertainment, and the historic Travellers’ Bar). (gallefacehotel.com)
• Tiki Bar & Sapphyr Lounge / Capital Bar — Shangri‑La Colombo (ocean‑view lounges and Tiki Bar with island‑style cocktails and live acoustic music). (shangri-la.com)
• Breeze Bar / Cheers Pub / other bars — Cinnamon Grand (poolside Breeze Bar with live performances; several lively bars & restaurants inside the hotel). (cinnamonhotels.azurewebsites.net)
• The Library / ColomBar / Lobby Lounge — Cinnamon Lakeside (popular hotel club/lounge “The Library” with DJs and pool table; ColomBar for local arrack cocktails; Lobby Lounge often features live music). (cinnamonhotels.com)
• Cloud Red (Cloud‑Red rooftop bar & infinity pool) — Cinnamon Red (Colombo’s high rooftop spot for sunset cocktails and tapas). (cinnamonhotels.com)
• Ward7 (rooftop restobar & infinity pool) — Jetwing Colombo Seven (sunset views, tapas/share plates, rooftop vibe). (jetwinghotels.com)
• Bayu (rooftop lounge) / Pool Bar — Sheraton Colombo (rooftop Asian lounge Bayu and rooftop/pool bar for drinks with skyline views). (marriott.com)
• YUMI (Japanese resto‑bar) & The Lattice (lobby lounge) — Taj Samudra (lively resto‑bar nights, DJs/live entertainment and classic lobby-bar ambiance). (tajhotels.com)

Quick tips

• Rooftop sunset views: Cloud Red (Cinnamon Red), Sky Lounge (Kingsbury), Ward7 (Jetwing) are especially good. (cinnamonhotels.com)
• Live bands / dancing: King of the Mambo (Galle Face), YUMI (Taj Samudra), The Library (Cinnamon Lakeside) frequently run live nights or DJs. (gallefacehotel.com)
• Reservation & dress: popular rooftop bars and evening venues often fill at sunset—reserve in advance and follow each hotel’s smart‑casual dress code. (Check the hotel page/contact before you go.) (cinnamonhotels.com)

If you want, I can:

• Make a short ranked list for a specific vibe (rooftop views, live music, or late‑night dancing).
• Pull current event nights or opening hours for any 2–3 of these venues right now.