Modi will lead the celebrations at Capitol Complex, designed by French architect Le Corbusier.
He is expected to arrive here tonight and participate in a mass demonstration of Common Yoga Protocol.
Over 30,000 people - 10,000 each from the Union Territory Chandigarh, Punjab and Haryana - will take part in the event at Capitol Complex and 10,000 at over 100 other locations across the city.
"All arrangements are in place for tomorrow's International Yoga Day event," said Chandigarh Home Secretary Anurag Aggarwal.
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Yoga enthusiasts can upload their videos while performing 'asanas' and send them to facebook.Com/iydchd2016 or tweet with #IYDCHD2016.
The first, second and third prize winners will get Rs 10,000, Rs 8,000 and Rs 5,000 respectively, officials said.
A selfie zone has also been set up at the venue.
Several LED screens have been put up at the venue, besides 300 prefabricated bio-toilets and over 300 dustbins.
Entry to the venue will start at 4 am and close by 5:30 am through designated entry points. While the main event will begin at 6.30 am, the Common Yoga Protocol will start at 7 am and last for 45 minutes.
MeT department here has forecast little possibility of rains but sudden thundery developments are possible.
Officials said participants at the International Yoga
Day event have been issued special radio frequency tags in order to track their attendance and secure the venue.
Ahead of the event, the UT Administration had organised Yoga flash-mob, moonlight yoga and a 'yoga run'. As part of the build-up to the mega event, world's first 3-D impressions of yoga were also displayed at Sukhna lake.
Ahead of the mega event, rehearsals were held yesterday which were also attended by defense personnel.
For the first time, 150 Divyangs, a nomenclature coined by Modi for differently-abled people, would be assisted in performing yogic asanas at the Capitol Complex.