Go Green!
100

The "yellow guy" in this webseries is understandably disappointed when he learns that green is not a creative color

What is Don't Hug Me I'm Scared?

300

In its namesake city, this river is famously dyed green every St. Patrick's day.

What is the Chicago River?

400

True practicers of Mason Bondiism wear a green tie-dye shirt on this day of the week

What is Thursday?

500

Green fireworks typically use ionic compounds of this alkaline earth to get their greenness. 

What is Barium?