Looks like there is at least some contact info on their website:
http://www.navypier.com/visit_us/faq_info.html#44 44. How can I coordinate a wedding, private party, corporate meeting, tradeshow or event at Navy Pier? Navy Pier has event space to meet any size group or occasion. Plan your next event at Chicago Landmark Navy Pier. Please click here to plan an event and for complete information about rental rates, amenities, and menus that can be obtained from the Special Events department. You may contact the Special Events department directly at (312) 595-5300 or via e-mail at [email protected].