YABUN FESTIVAL
Sydney's biggest celebration of Aboriginal and Torres Strait Islander culture returns with a headline set from rock-reggae musician Bart Willoughby and performances of traditional dance. Tuesday, 10am-7pm, Victoria Park, corner Parramatta and City roads, Camperdown, free, yabun.org.au. 
THE ROCKS
The historic district springs to life with a croquet green, market stalls and a musical line-up including the Grates (pictured), Melbourne Ska Orchestra and Katy Steele of Little Birdy fame. Tuesday, 12.30-6.30pm, throughout The Rocks, free, therocks.com.
ENMORE PARK
At a family-friendly bash in Marrickville little ones can meet native animals, see a blacksmith at work or take on an obstacle course, while adults can organise a park picnic with the many multicultural foods on offer. Tuesday, 3-9pm, Enmore Park, Enmore Road, Marrickville, free, marrickville.nsw.gov.au.
PARRAMATTA PARK
Parramatta's celebrations kick off with a hot air balloon show filling the sky with colour. Revellers can also view a display of vintage cars, attend a Hottest 100 party or listen to live entertainment from X Factor finalists Jess and Matt, country musician Troy Cassar-Daley and pop star Christine Anu. Tuesday, 6am-9pm, Parramatta Park, corner Macquarie and Pitt streets, Parramatta, free, ausdayparramatta.com.au.