Yes, a day pass is available, however they're not available for pre-purchase. You can only get Day Passes at JordanCon.
Prices for JordanCon 2017 are:
Saturday & Sunday: $50
We accept cash, check, and debit/credit (Visa, Mastercard, AMEX, Discover and JCB).
The Child Membership is for children under 12 ($10 off an adult price). Children under 5 will be admitted free, but must be supervised at all times. For all other children, please purchase an Adult Membership.