ONseason Calendar Mark Variations
Calendar/progress-mark directions: checkmarks, no checkmarks, shaded dots, grid tiles, and more abstract season-progress options. Same navy/blue system, with a few font pairings.
Checkmark directions
No-check directions
More abstract season-progress directions
Recommendation
My strongest direction: C or D for the brand mark. I would avoid checkmarks in the core logo unless you really want the product to feel like a habit/task tracker. Checkmarks are useful inside the app calendar, but they make the logo busier and less athletic. For the actual calendar UI, D is probably strongest: filled/shaded days for completed or active work, outlined dots/tiles for future days, and a ring for today.