From the email I received
Double Dip! Up to 50% off food + 500 Yums!
We’ve got TheFork Festival running until 28th March, with hundreds of restaurants offering up to 50% off the food bill.
Plus if you make a booking via TheFork app today until Saturday 6th March (inclusive), and use the code FEST500 at checkout, you’ll earn 500 Yums, instead of the usual 150!
Not as good as this summer one (https://www.ozbargain.com.au/node/602142) but at least you can stack it with the Fork Festival (https://www.ozbargain.com.au/node/604292)
Reach 1000 Yums, you can get $20 off your next bill. Reach 2000 Yums and I think it was $50 off your next bill
For new users to The Fork/and something for existing members to try
"I was able to use APP21 as existing member and still got my 1000 yums! If signing up as new member, best to use referral and book via website. That way still allows you to earn yum points from app specific codes like this deal"