YMB, what retro has said is:
"I believe someone posted her daughter was visiting London to attend a show a while ago. The poster,herself,had not visited London for years and was worried for her daughter and family. With some justification I reluctantly concede. "
If you think going to a show in London should cause other family members worry, then you're fear mongering.
I've been to London multiple times in 2018 and not once did i see a gram of violence. There was once incident on the tube where i felt a bit intimidated, but that was my own fault, for apparently looking someone in the eye. The situation quickly calmed down. This would never happen to anyone who wasn't my age though, such as an older person or even a much younger person.
I went to London literally to hang about. Let alone have a specific agenda like a show to go to.