IV discrepancy

One of my weakest points is following the news.
Example:
IV on spy for Monday's options is 12.7% (low because of the weekend discount, I know.)
IV for Tuesday is 23%.
Obviously, there is some upcoming event, likely the Fed.
But the fed calendar ( https://www.federalreserve.gov/newsevents/calendar.htm ) doesn't show anything as a trigger for mon a/n - Tues.

Is there a list of (Fed especially) announcements / meetings that one can get, especially one that includes analysis of IV / HV impact? (I'd pay a small monthly fee for that, if it exists.)

What events have the biggest effect on IV?
Interest rate announcements for now, I think.
Anyway, any insight Fedpros and Newspros can offer is appreciated.
 
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