Are kids at the age of 13 are allowed when a rapper is having a concert at the venue?

Depends on the performer and if the venue allows it. I believe for events they have notice on the event advertising age restrictions. Other than that I am speculating so I would call the box office

https://www.reventionmusiccenter.com/faq

Most shows are 18+ unless specified all ages for that specific show

Thank u so can a 13 year old come to nba youngboys concert