Southsea's Victorious Festival is the latest festival to confirm it will be going ahead, following the Prime Minister's roadmap announcement.
The event, which is held just across the Solent on Southsea seafront, is popular among Islanders.
Organisers say planning is "well underway" for the weekend of August 27.
It comes hours after Islander Rob Da Bank announced Camp Bestival will also go ahead. It will be held at Lulworth Dorset at the end of July.
Yesterday (Wednesday), Reading and Leeds festivals confirmed the event will happen.
Tickets are also on sale for Let's Rock Southampton, which takes place on July 10.
England's roadmap out of lockdown sets out plans to removed all legal limits on social contact by June 21.