Tonight is the night! Nik Wallenda walks the high wire over a Nicaraguan volcano! Days before Nik and his wife, Erendira left for Masaya Volcano National Park, Erendira announced on Instagram the event would include, “The Biggest Stunt That Nikolas And I Have Ever Done Together.” Exactly what Erendira, a seventh-generation aerialist who frequently performs with Nik, has in mind is under wraps! “Volcano Live!” is on tonight at 8 on ABC,