Some common conference events are:
Keynote Speaker(s): Someone with an in-depth knowledge about a certain area of the topic of the conference who will give a speech on the subject, often followed by a Q&A session.
Debates: Two or more speakers with opposing views on a topic. It's important to have a strong chairperson to ensure the debate flows.
Workshops: Less formal meetings where a panel of people discuss a topic.
Masterclasses: An 'expert' in a field demonstrates a skill or technique, Left hand guitar player perhaps, or customising a MySpace layout.
Music: It's a good idea to include some music in the program. This gives you a chance to showcase artists and provides some entertainment for the attendees, plus gigs provide a good informal networking opportunity. It could range from an acoustic act playing during a networking lunch to a full blown gig to open/close the conference. A musician may combine a live performance with a masterclass, or may be persuaded to give a keynote speech if you also organize a gig for them. Remember though not all great musicians are great speakers.
- Networking: As well as formal events it's a good idea to have informal events and places delegates can spend time if they're not interested in a particular debate or workshop. This could be a café or bar area, 'trade fair' with stalls from various companies, organizations of interest to the delegates, or some form of entertainment. These all provide an area for delegates to network, one of the most important parts of a conference.

