Cardiff Castle Event Capacity 2025 Capacity. A historic visitor attraction with meeting space and a banqueting evening is why it's a great option. Subject to licence, blackweir live will debut with four headline gigs and with the capacity set at up to 35,000 people, it will be the city’s largest greenfield venue.
Blackweir fields, an extension of bute park, is set to be used. Find upcoming events at cardiff castle in cardiff.