Discarded Christmas tress, some still with tinsel attached to branches are piling up in J.F. Gregory Park before the “Bring One for the Chipper Day,” which is scheduled for Saturday. Residents can drop off old Christmas trees at any time this week at the park. The trees will be recycled into mulch Saturday. The “Chipper” day is a statewide annual event the city has participated in over the years. The first 250 residents to drop off their trees Saturday will receive a red maple tree.