Peppa afternoon tea bus in London, summer or Christmas lights?

[Green6]

I have a two and four year old who are Peppa obsessed. I am planning on taking them on the afternoon tea bus in London but can't decide between going in summer or waiting until Christmas for the Christmas lights one.

Has anyone done either (or both even)?

No experience but would they be tired for the night one? Or more likely to have picked up a Winter bug? Just a thought. I’d go for Summer.