Visitors to Lewes should be aware of the practical difficulties getting transport to and from the event, Lewes District Council warns.
Road closures will affect large parts of Lewes with diversions in place for traffic to travel outside of the town.
Residents are advised to get vehicles home before 5pm to avoid any road closures in place.
Visitors are advised not to bring vehicles but instead use public transport.
The A26 and A27 will be open to through traffic only for the duration. No parking or waiting is allowed. Vehicles risk being towed if parked.
There are likely to be long waiting times for trains in and out of Lewes. Last services are from midnight to 12.30am.