@Bonnie330 You didn't do anything to generate that multicalendar. It shows like that for everyone- I also only have one listing. Why they can't just have "Monthly Calendar" as something that's obvious and just needs to be clicked on is beyond me. Airbnb programmers seem to love making things as non-intuitive as possible.
Promotions- not sure, never had any myself. Look for "Pricing" in your settings.