Which of these is NOT a necessary officer for holding a meeting?

In a meeting, the essential officers typically include a president and a secretary, as their roles are crucial for facilitating the meeting and taking minutes. The president is responsible for leading the meeting, ensuring that the agenda is followed, and maintaining order. The secretary is vital for documenting what occurs during the meeting and keeping official records, which are important for transparency and accountability.

While a treasurer plays a significant role in managing the financial aspects of an organization, their presence is not strictly necessary for every meeting. Financial topics can often be addressed in meetings without the treasurer present, particularly if there are no financial decisions being made or if a report can be provided by someone else. Thus, the position of treasurer isn't essential for the immediate functions of holding a meeting, making it the correct answer as the officer that is not required to hold a meeting.