From the site:
"At Eureka Skydeck we appreciate all the hard work that teachers do for our students and we want to thank them for all their efforts! That’s why we are giving teachers FREE ENTRY to the Skydeck between the 1st and 7th October 2018 to help celebrate World Teachers Day!
Teachers simply present your VIT card to the staff at ticketing upon arrival to receive one free entry.
*Admission for one adult upon presentation of a 2018/2019 VIT card only. Does not include the Edge Experience."
For some people Eureka could be interesting for some others it's just wasted money and boring.
Once you're there you see "concrete all around" because Melbourne has became tall big concrete buildings (another person's impression).
And then what else can you do there? Buy a hot dog or a boring and expensive made in China souvenir? Actually there seem to be ONE thing interesting to do but you must pay for it!
Yeah Teachers' Day, bring in hundreds of students and we'll only care about that.