Be they holiday bells, morning wake up balls, or………. other bells are common enough that people just know what they are without really being explained beyond the specific type.
So for tonight draw somepony with, near, using, etc whatever with a bell. And don’t be afraid to use an old bell if you want. a crack or dent is nothing to be ashamed of.
So you have 30 minutes to draw and 15 to submit to the inbox starting at the sound of the bell.