Answer
Treat the decision as a small piece of due diligence. For traditional arts and performances, ask about performer or maker background, cultural context, programme length, photography, audience participation, ticketing, accessibility and whether the activity supports local practitioners.
Record the answers that matter to you and make sure any confirmation reflects them. This is particularly important when transport, children, equipment, dietary requirements or weather can change the experience.
Authenticity is better judged by transparent attribution and community involvement than by a performance simply being advertised as 'traditional'.
Reconfirm shortly before arrival if the plan depends on a schedule, event, tide, weather condition or limited availability.