Huh, thought I'd been checking in on the game multiple times every day without fail... Certainly never missed any days of any of the events before. But I just completely missed the first day of this new steampunk event, apparently. Saw that a new event has started and then saw that it was already on the day 2 mission.
Edit: Wait, now how did I miss out on day 11 as well?! I know I didn't skip a day, but the game thinks I did.