At our Harry Potter Murder Mystery Dinner Party, to create Hogwarts I staged a few of the classrooms.
One of these classes was Divinations.
Some smoke (or fog machine), old tea cups, candles, cobwebs, beads, crystal ball, and some taro cards did the job.
Printable Taro Cards found: here
Wall printables and classroom printables found: here
For the rest of the Harry Potter Murder Mystery Dinner Party details, printables, and tutorials look: here