Depends on weather and walk up I'd say. Hopefully if it stays dry then I'd guess around 16k. Been away so not sure what the advertising has been like for it?
Promotions have been strong.
Frequent, professional advertisements during both State of Origin matches thus far on FoxSports, and also on the delayed telecast via Free to Air (Channel 9 Perth) which would have reached both pay TV and free TV audiences during the largest TV NRL event of the year. Also plays an advert on Channel 9 essentially every night during delayed telecasts of regular matches as well (each week).
The West Australian has had several articles (some full page) which is great, since they have been very silent on Rugby League and the WA Reds for a while; the Sunday Times has continued their fortnightly reports which is fantastic; the newspaper this morning had a full page colour advert in the sport section. Additionally, radio advertising has also been operating.
Personally, I would not be happy with anything less than 17,000. I think 15,000 would be disappointing. I'd love more than 20,000 though we must remember the Australia v China basketball will be playing at Challenge Stadium simultaneously which may distract some casual fans. Of course, weather plays a role as well.