Moderated events require attention to few simple yet very important aspects.
There is one aspect of moderated chat that is underestimated by most people - these events attract people who have never chatted before and may not chat again. They arrive in your channel on the hour and have zero time to learn how IRC works, how to message a person and so on. (+m) moderation mode as per standards IRCd means you need to educate people how to message the moderators.
Another aspect of the classical +m is a single direction of the questions. This again is not suitable if there needs to be more than one person making a decision if the question is admissible or not. You may think it is while the artist’s management may have other ideas.
Moderation is about arranging questions in topical groups, filtering them, getting artist's message across, providing mix of topical and of topic questions to make the event interesting and not boring. The star guest and the audience do not care about IRCd. They are there for each other and the mechanics behind the medium are the least of their interest.
1. Such event can attract unusually high number of people into a single room. Having +A means you do not download the user list upon joining of the channel, which in such cases can be of substantial size. This mode also suppresses many other messages. In a busy channel as interview auditorium you want the guests to concentrate on the event not on flood of technical messages irrelevant to the event.
2. Pairing of rooms using +M and +N, where one of the rooms is only for moderator to select questions from. This pairing means you can have a number of moderators involved, and secondly it means users simply ask questions to the channel, all of them get redirected to the moderator's room.
event management wizard allows for easy management of the question queue if you chose to use it.
4. Automatic spawning of new rooms that see the same event. This is often called Auditorium Rows by CR and many other chat systems, which provide auditorium facilities.