It is highly unlikely that vendors would stay to exhibit on Sunday. First, the crowds would be less, making it not worth their time to be there. Second, they are anxious to get back to work on Monday and will need Sunday for travel. The Expo is tiny compared to the Louisville truck show. Even with thousands of attendees still roaming the aisles, you see vendors packing up before the show even ends to get out of Dodge and get home to start their week.
If workshops are to be offered on Sunday, don't forget about the expense. Hotel meeting rooms are not made available for free. Consider a self-sustaining day of intense training on Sunday for which admission is charged to pay for the rooms. Call it the Expedite Acadamy.
Just a thought, but not an idea I'd be in favor of. Keep in mind that EO already sponsors a popular series of workshops at various locations throughout the year.
I prefer to leave Sunday as a non-event day. After two days at the show, rest is needed and quiet time is used to process the information gathered and networking conversations had. If a full day of Sunday activities came to be, and if we chose to attend, we would stay out of service on Monday to decompress and process the information and conversations.
Others may not work the show as hard as we do so that may not be an issue. When we go to the show, we are there to work, not play. The cookout is as much a working event for me as giving a workshop is. When the show is over, I need a day of rest.