Kennebunkport, Maine, 2019-Feb-12 — /Travel PR News/ — Celebrating their 10th Anniversary, GLP Films (GLP), an award-winning content marketing agency for the travel and sustainability industries, announces an open call for video submissions for their upcoming film event at ITB Berlin.  The “6th Annual Short-Film Showcase” will feature the best sustainable tourism films from around the globe at… Read the full press release