Well considering that the timezone of Macau is in the thread, it is as simple as making the maths. Everyone should know what timezone they live in.

UK is UTC, which means UTC+0. In order to convert Macau (UTC+8) to UTC+0, you need to substract 8: 20-8=12. The concert starts at 12:00 UK time.

Edit: 13:00 as you are in daylight saving time (UTC+1).

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