Thank you so much for the feedback and suggestions!
Honestly, I love the idea of the event cards! I talked with my partner, and we now have ideas for Weather cards (drawn at the beginning of the game, and again at the top of the 5th hour) that will affect the game throughout, and Event cards (drawn at the top of every hour) that affect the game for the hour it's drawn on. They'll be optional, and I'm going to run them through the next playtest to see how they work with the balance of the game.