Do you mean their Event Barn? If yes, your best bet is to go on their website and email. Last I remember the event fee was in the neighborhood of $5k just to reserve it but those prices may have changed. Dates are probably no longer available but you should also ask this in your email to them. I think their email is something like flahertyfamilyfarm@gmail but I do not remember for sure.
I can't remember for sure but I think it was $3 or $5. This is for entrance. Don't know what it is for booths though.
Thanks! Your answer is awaiting moderation.