Will I get turned away at an 18 and over concert if am 17 but have a ticket?

It depends on the venue and the event organizer's policies. Some venues and event organizers may allow underaged individuals to attend 18 and over concerts with a valid ticket and a parent or legal guardian present. Others may strictly enforce the age restriction and deny entry to anyone under the age of 18, even with a ticket.

To ensure that you are able to attend the concert, it is best to contact the venue or event organizer directly and inquire about their policy on underaged individuals attending 18 and over events. They will be able to provide you with accurate and up-to-date information on whether you will be allowed to enter with a valid ticket.