A "call for submissions" is used to describe an event where people are invited to submit original content. Calls for submissions are commonly associated with events like conferences or hackathons, but they can also be used to highlight specific topics on a blog or website. Most calls for submissions explicitly require that the submission include a brief description of the topic and a detailed outline of what will be covered in the submitted article. Calls for submissions often include a deadline by which all submissions must be received and reviewed, as well as rules prohibiting plagiarism or use of copyrighted material from other sources.
Call for submission articles are used to solicit contributions, promote open source projects, or request feedback from industry experts. These articles help provide context and remind readers that there is always something you can contribute to the development community.