Macquarie Centre in Macquarie Park NSW are giving Event Cinemas tickets away to those who log in to the WiFi. It does require you to enter a correct phone number as you will receive an SMS after about an hour which you then present to the concierge desk on the same day for the ticket. Ticket is only valid for Macquarie Centre cinema.
I didn't stay connected for 60 minutes (probably 10 minutes at most) and I got the SMS an hour later.
Offer valid for WiFi connections made from 9am - 5pm from 11 October to 24 October or while stocks last. All three checkboxes must be ticked during the sign up to WiFi. Limited to one movie ticket per customer per WiFi connection. Redemption must be made on the same day with proof of SMS presented at the Concierge Desk. Movie ticket accepted only at Event Cinemas Macquarie Centre and valid until 31 December 2021.
Further terms and conditions here