Quick thoughts:
Ask your dancers what would help?
Do you have “strangers” or inappropriate people scaring new dancers away? Please don’t pretend that isn’t a factor, even if you think it shouldn’t be. It is. 
Free snacks?
Great music?
Experienced people come when they come. They know they don’t need to be there at the start.

Sent from miHand,

Peter

‘…the slimmest of instructions, “To use your gifts and dreams for good.” ’
— From Braiding Sweetgrass by Robin Wall Kimmerer