Crowds of up to 15,000 fans can watch this weekend’s Showdown 50 at Adelaide Oval.Promoters are scrambling to save giant rock tours with US superstars Guns N’ Roses and Kiss set to reschedule their Australian tour dates.Mask mandates will remain in South Australia “for the foreseeable future” – likely for some weeks – as authorities try to prevent any Delta virus incursion from NSW.Port Adelaide will again not be able to wear its prison-bar guernsey in the Showdown.For updates and breaking news throughout the day take out a subscription at advertiser.com.au.