The Swan, Hyde Park: Pub in Westminster, London

The Swan is an outdoor venue in W2, so the weather is part of the plan. A mild evening lets the open air do most of the work. A cold one means a proper layer and a bit more intent. Live music is what it tends to host. That suits the space. The sets are easy to drift into, easy to stand close to or sit back from, and easy to leave when you've had enough. It's a good fit if you like hearing live music outdoors without the pressure of a formal night out. Arrive a little early if you want a spot near the front. Keep an eye on the forecast before you set off, and bring something warm for when the sun drops.