Nice moniker, trstno1. We've heard similar theories about Saturdays in the park, when Spectro is often shown. And we've investigated this specific question, as it seems to come up often.
Based on the data we've collected, however, we don't see any evidence to support the idea the Spectro days (or Saturdays) significantly increases park attendence.
We've got an extensive data collection project starting in January, so we'll be checking all of our assumptions again. If anyone has, say, an Excel spreadsheet with observations they'd like to share (hey, you never know ;-) ), especially something that contradicts our data, I'd love to take a look.
I wouldn't worry about the crowds in the MK on a Monday in February, either, unless the crowd level is > 5. Relax and enjoy the park!
If there's anything we can help you with for your trip, trstno1, feel free to drop me a line.
Sincerely,
Len