Hey Peter,
Thank you for your interest in our plugins for your project!
Unfortunately, this is not quite possible, in my opinion:
Is The Events Calendar capable to handle 200.000 or more evnts?
If you have top-of-the-line web hosting or something, then handling 200,000 events may be possible, but it will be very slow and very hard on your site at best.
We are working hard on improving this but for now, unfortunately, our performance with high numbers of events like that leaves much to be improved upon.
Cheers,
George