Here are some ideas....
Anyone who is into what is referred to as ‘New Age’ stuff.
Like crystals, horoscopes,
Astrology,
Runes, and Tarot Cards. 
You can make an event on Face Book, send out text... even use snail
mail. 
Let them know questions can be done privately, if they don’t want everyone to be involved. So may need area for that.
I don’t know what to say, to my invites?
Here is an idea.
“I’m having a Gypsy Party, a tarot reader is going to come and we will be able to ask her a question for $30. For $60 they can do a Mini Witch Stones Reading, the reading will last about 15-20 minutes.”
What kind of question do people ask?
Anything can be asked! 
- What do I need in my life to nurture me?


- I feel stuck, what is holding me back?

- You can ask a general question and see what cards will say.
Or there are some popular questions like the following:
- What is at the root of my romantic problems?

- A situation is not going my way, what is the best way to resolve it?


- I am having conflict, what is the best solution?


- How can I leave this sadness/grief behind me and move on?
