1. to (go) open, to come open (For doors, shoes, zippers and a few metaphorical contexts.)
Opposite (closest): zugehen
2. to rise, to go up (For the sun, the moon and dough. And a figurative "light".)
Opposite (closest): untergehen
3. to work out, to pan out (For plans and tactics or theories.)
4. to find (complete) fulfillment, to get lost in ("aufgehen in+Dat" - in a positive sense for jobs, activities and hobbies where you really lose yourself in a good way. Also for something being integrated into something else, like a company for instance, but that's hard to use idiomatically)
5. to go up on stage (It's the proper term for going on stage in the context of a show, especially theater and other classical stuff.)
Opposite (closest): abgehen
6. to suddenly "be understood" by someone ("jemandem+Dat aufgehen" - Used for facts or connections that become clear to someone, a bit like an epiphany. You can think of it as a light rising, or as a "flower of knowledge" opening.)
