I think a lot of engagement has to do with clever branding and marketing. websites are great because they help you brand your message and target your audience.
For example, http://www.elevatedgrounds.com/ is a great website that actively can draw youth attention to the arts. They can audition if they have an art interest but it is also targeted to employment and health education.
The Emerge Project: https://www.facebook.com/TheEmergeProject
is also another initiative that I was a part of that has youth engage youth to start the conversation and participate in mental health education.
I also find a catchy way is to understand what youth are attracted to and offer those services while offering mental health education.
Often youth tend to constructively do things that benefit mental health yet that connection is never cognitively made.
The ability is for youth to recognize mental health issues and no how to address that and accept that that is a constructive way of healing and expressing themselves.
Sometimes it is youth who understand adaptation the best so it is good to offer the services but it is great to also see how they access information and integrate health into their individuation process.