The purpose of this talk is to call teenagers to a personal commitment to God in Jesus Christ. However, this should not be an altar call. The teens should not be asked to make any sort of public proclamation or commitment in front of the group.
You are given 30 minutes for your talk.
Most teenagers have probably responded in some way to the good news of Jesus; it is perfectly acceptable and beneficial for them to renew their commitment during the weekend. It is in fact beneficial for them to make a renewal of sorts as the need arises or even on a regular or daily basis.
Some teenagers have never heard the good news of Jesus, and need to make an initial commitment to Jesus Christ. This talk calls young people to make a personal response to the Gospel based on the experiences of the previous day.
Themes you should include in your talk: