One last thing: arrive 30 minutes early. Not because the security line is huge (it’s normally fine), but because the Hall itself is a marvel.
Spend ten minutes staring up at the giant organ, or the glass dome that looks like a retina. It saves you from that awkward, frantic rush to find your seat right as the conductor raises their baton.
And if you’re still lost? Ask a local. Londoners in Kensington are used it. They’ll point you in the right direction, probably with a slightly smug smile. It’s okay—you’ll smug smile too, once you’re inside, on time, and sipping a very expensive glass of wine.