Vague in some ways is OK, but one thing you should spell out initially is where you have to be to take advantage of this. It sounds like an in-person thing, so

Vague in some ways is OK, but one thing you should spell out initially is where you have to be to take advantage of this. It sounds like an in-person thing, so unless you want the majority of applicants to be disappointed after investing interest, you should clarify that participants need to be in a certain area, e.g. NY, Seattle, SF, Kansas (good luck with that one...).