someone who enlists workers to join a union
"The labor organizer spent weeks meeting with factory employees to convince them to join the new union."
a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.
"He kept his daily schedule and reminders on his organizer, using it to track appointments without needing a full smartphone."
A person who arranges the details of a public event.
"The community organizer arranged every detail of the charity gala, from ticket sales to stage setup."
In plain English: An organizer is someone who plans and arranges events so everything runs smoothly.
"The event organizer made sure everyone had their tickets before the show started."
Usage: An organizer refers to the individual responsible for planning and coordinating an event, distinct from someone merely assisting or attending. Use this term when highlighting leadership in arranging logistics rather than just participating as a volunteer.
The word organizer comes from the verb organize with the suffix -er added to it. It follows the standard pattern of forming a noun that denotes someone or something that performs the action of organizing.