Winter Retreat for High Schoolers. Looking to be refreshed and renewed in the middle of the school year? Come to Winter Retreat for engaging speakers and worship! Held at the Bongiorno Conference Center in Carlisle, PA. Cost is $125 if paid by December 4th, OR $150 if paid by December 11th. Cost includes accommodations (2 nights), food (5 meals), and Retreat events! Leaving Calvary Church at about 3:30pm on Friday, and returning Sunday afternoon. An Event Medical Release form will need to be filled out and turned in for each student wanting to attend.