If they are open Wednesday to Sunday that is your 5 day work week. If you wanted to be open 7 days a week it would require a lot more people to be able to rotate and provide everyone a 5 day week.
You are right about Microsoft. Their Ignite event (held at the Orange County Convention Center) would include a night, over the past couple of years, as their event ran in September, where they would provide their attendees with an option to buy HHN tickets and they would buy out the park. That wont happen in 2019 as their show runs November 4 - 8.
Agree with you that the first two to 4 Wednesdays will not be active. But, with the crowd levels being what they were last year I wouldnt put it past them.
Plus we can expect a definite increase in prices as they have already announced an increase in scareactor pay.