Having a pre-made adventure can really get a game off the ground quickly. Whether you're adding it into an ongoing campaign or just running it on its own, it does a lot of the work for the GM. The City of Vermilion is one such campaign. The new oldschool adventure is up on Kickstarter now.
From the campaign:
The legendary City of Vermilion: birthplace of a thousand legends, hiding place of a thousand secrets--this den of iniquity will form the centerpiece for a Sword & Sorcery campaign in the manner of Fafhrd & the Grey Mouser. Your adventures will take you from its steep, plastered rooftops to its decrepit, ancient sewers, to the silken parlors of merchant princes to the cramped and labyrinthine alleyways of the thieves quarter or even to the depths of the Maelstrom!
City of Vermillion is an oldschool tabletop roleplaying adventure set within the fabled island of Vermilion surrounded by the Zontani Sea, where our heroes will encounter perils and wonders never before seen. It's made for the OSRIC ruleset and fully compatible with other old school gaming systems (Labyrinth Lord, For Gold & Glory etc. etc.).
The campaign is up and running now. It's set to go for another 26 days.