At least 10 were arrested in the vicinity of the Marine Parade skirmishes, before and as the young people were dispersed, heading mainly for the fringes of the inner city and outside a liquor ban area.
More arrests were made during the night, with at least four for assault and six for disorderly behaviour, although no injuries were reported.
The disorder and apparent intoxication came despite a liquor ban on CBD streets and Marine Parade, also precluding the taking of BYO supplies to events. The ban was relaxed for the period of Sunday's Great Gatsby picnic, which was billed by the Art Deco Trust as "the festival's most extravagant party."
Some sites were specifically licensed for Art Deco festivities in addition to established bars and restaurants.