"One night, a piece of the sky fell to earth..."
"Visitors from Above" introduces the DM and players to the concept of flying ships, alien races, and space travel as described in the AD&D SPELLJAMMER boxed set. The adventure is compatible with AD&D 2nd Edition rules and the Monstrous Compendium, but can easily be played with only AD&D 1st Edition rules.
"The adventure is designed for 4-9 characters of 4th-8th level (a maximum of 30 total levels).
"The PCs begin in the city of Neverwinter and must venture upriver through the Neverwinter Woods to Mount Hotenow."
I would suggest changing this to Forgotten Realms AND Spelljammer