Not my cup of tea this ond. As a non musical person, these musical ones are always a right pain. Too much of the grid was thematic in my view, which meant grinding out the rest was a bit of a nightmare, for me anyway.
I can't parse 10d, and the rest of the first 7 down letters make no sense to me (not helped by two possible extra letters for 8). Do I need to know the 2,5,5 - I assume the event is the one which this is an anniversary of?
I've done everything else, but I have no idea what's going on with the bottom row. Is the venue LS in M?