That's it. 2 items, just handbaggage.
Enough medicine and ostomy equipment, camera, phone and ipad. The essence of traveling light. But also no extra cloths except those I am wearing.
One got to be prepared to know how to get to the hotel and then to the concert. Google maps helps a lot. Best to find out before traveling and take copy of what Google maps says.
If the hotel has free wifi it is even better and easier to use ipad or iphone to go directly to where you want.
Take a lot of photos. Why else have a big camera with you? Iphone can take photos, but really how good are they?