Tank Wilson's well done tale "
Day Follows Nightfall " explores the idea that after Clark's encounter with the Nightfall Asteroid he ends up somewhere other than Metropolis.
In Shayne Terry's delightful tale "
Gossip " the fine folks in Smallville know that Clark is Superman.
In a number of FanFics one of more of the following Lois, Lucy, Jack, Perry, Jimmy, Cat & Henderson, have figured out that Clark is Superman.
How about combining the two ideas.
After Nightfall Clark crashes somewhere on the Earth. As the silence from Superman continues a growing number of people work together trying to locate Clark Kent without letting the wider world know they are really searching for Superman.