The HAMvention Chairman did not indicate that the FREE ticket holders would participate in any Sunday prize drawings. I've heard nothing from any other W5KUB broadcast interviews saying otherwise and I haven't any way to confirm if it actually happen.
Looking at the HAMvention web site under the PRIZE section, nothing said there either. The 2019 major Prize winners for the top 14-prizes were all Hams. Also the process for collecting admission tickets did not indicate if any special "special" handling for the Sunday FREE admission tickets to be excluded from the prize drawings. If that was the case, clearly it would not be disclosed on the web site.
Someone with 2019 HAMvention needs to answer this question.