* The title is slightly different: Maybe it's "Picnic" with a different spelling or a similar title.
* It's a lesser-known film: If it's an independent or foreign film, it might be hard to find information about it.
* You're thinking of a TV show or other media: Perhaps it's a TV series or a play.
To help me find the correct movie, please provide more information:
* The full title of the movie: If you remember any other words in the title, please include them.
* The year of release: If you're sure it was released in 1983, that helps narrow down the search.
* The genre of the movie: Was it a comedy, drama, thriller, or something else?
* Any other details you remember: Do you remember anything about the plot or the actors' names?
Once I have more information, I can try to find the movie and its cast for you!