How do I give organisers more rights than attendees?

With tags, on paid plans. A tag is what separates one person from another in your space, and it carries both what someone may do and where they may go. Some tags have special meaning (like admin), but you can attribute any tag you want to a user (for instance: “HR”, or “speaker”). You can then use that tag to give them special rights (like moderation rights), or to restrict access to certain areas of your map.

One more thing worth doing. Tags are invisible on a map. You can attach specific skins.