The new multi-use arena will include a cinema, bowling and e-gaming studio.
Organisers say the parade will be free to attend on the avenue, with floats going in one direction.
The building will be five-storeys tall, including a rooftop kick pitch, project leaders say.
People in Jersey are invited to view updated plans for Fort Regent at a public exhibition.
Online and phone banking services will be available as usual, the bank says.
The government has described the £2.3m sale as "value for money".
DFDS says the stern of its Tarifa Jet was damaged in the incident in Jersey.
Jersey's emergency services will be tested during an exercise at Fort Regent.
Deputy David Warr says the sale of the property in St Helier should better benefit the community.
