Retreat v.s Charrette

Next coming week comes two big events - RCCCF 2006 Retreat and RIT Humber Charrette. One is from church, and one is from school. Both events happen on the same weekend from January 20-22, 2006. It is a dilemma for me because I want to go to both events; however, I know I cannot, and I have to choose only one. The school event is a good oppotunity to work with another school students to design solutions for specific topics using Macromedia Flash, which is my study field and future work field. Besides, the final projects will be presented on April in FITC conference in Canada. On the other hand, since I missed the retreat last year, I do not want to miss again this year. How should I do??? Ah......