Replying to Creating interest

So a group at my university created a trip to Le Massif for a couple of days. It's $395 for like 4 days all inclusive except for food. Price is also non-negotiable it's the lowest it can possibly be. The problem is its only like half full, and we need it to be full to make the trip a go. Anyone have any good ideas to market it so people will be interested? I and one of the groups founders consistently post mountain conditions etc.