As the PPs have said, the crowds have been generally higher this year (since the start of the 60th Anniversary Celebration) than in past years, so while I do think you'll see lighter crowds on the weekdays than weekend days, I don't think you're going to see low crowds even on the weekdays. As mentioned, there might be some residual weekend crowds on Monday and some increase crowds on Thursday due to one of Dance the Magic's events happening that weekend.