Field Days are free to members, and open to non-members for one-day only fees of $15/individual and $30/family (parents with their small children) at each event. Fees can be paid at the door or in advance with a credit card through PayPal (you don’t need a PayPal account) for an additional $1 service fee:
Revised Winter Field Day Schedule
List of Scionwood and roostocks for the Winter Field Day
http://nwfruit.org/winter-field-day/