Standing Meeting
A regularly scheduled appointment, such as a weekly one-on-one with a boss or a department; or a project meeting taking place at intervals until the project is over. Since these meetings recur, their format and agenda become relatively well established. Although it's important to hold these meetings at routine intervals for convenience and consistency, at times they can be rescheduled.
Topical Meeting
A gathering called to discuss one subject, such as a work issue or a task related to a project.
Presentation
A highly structured meeting where one or more people speak and a moderator leads the proceedings. The purpose is usually to inform. Attendees may have an opportunity to ask questions, but typically their participation is limited.
Conference
A highly structured, moderated meeting, like a presentation, where various participants contribute following a fixed agenda.
Emergency Meeting
A meeting called to address a crisis, whether internal or external. Such meetings are often arranged with very little notice, but attendance is mandatory. If the emergency meeting conflicts with another appointment, the emergency meeting typically takes precedence.
Seminar
A structured meeting with an educational purpose. Seminars are usually led by people with expertise in the subject matter.