Some years are like that. Go along for years sometimes with barely a sniffle, turn a corner, and you find the calendar has more filled spaces than empty and is now more than just a pretty picture on the cellar door. I've become one of those people who now says "let me check the calendar" before agreeing to ANYthing.
Nothing major, just fiddly bits that all need attention, in that "well, since I'm right here..." mode.
And then, with any luck, we can relax back into calendars that remind us what day it might be and even in some instances what month.