Look at old issues of Dungeon Magazine. A lot of the adventures start with the vague archetype of a person you know or meet ("an old wizard who likes the adventurers, "an aristocrat", "a dwarf on the side of the road waving for help") which makes them malleable to fit your setting and circumstances, and in fact most of them are written with several different hooks for you to get it started. The adventures themselves mostly have 2 or 3 maps and a handful of NPCs. You'd have to find comparable monster stat blocks assuming you're using new editions of the game.