Pandam (the bear that shows up on Wednesdays) won't show up until you've played on a particular save file for 7 campaign days. Note that:
- This is 7 days of actually doing stuff in the game, not 7 days elapsing from the first day you played.
- A new day starts at 5am according to your device/computer's clock.
- If you're going to mess with your clock/calendar trying to advance faster than intended, please see this FAQ on how to do it safely, and please *don't* email Support if your save gets goofed up. I'm sorry, but we're a small company and don't have the manpower to fix it; you will have to get yourself unstuck or start over.