Dress is casual. I have been to several forums and you see people wearing jeans and t-shirts as well as business casual. I always bring a sweater or jacket with me as some of the meeting rooms get pretty chilly. I am opting for comfort this forum.
Rather than repeat answers that have already been provided, take a look at: https://communities.sas.com/t5/SAS-Global-Forum-2017/Dress-code-at-conference/gpm-p/344451
Art, CEO, AnalystFinder.com
Most attendees wear business casual, although often presenters will step it up just a bit. Remember that convention center presentation rooms tend to be on the COLD side.
As an old-timer, I just want to add that I have noticed a trend among the younger attendees to dress up a bit more. Suits are a novelty to them, so some look for opportunities to wear them.
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