Feedback is very important while organizing a conference or when organizing or creating anything. Right feedback when it comes it can give you everything. I mean really everything. It can show you what you are doing right or wrong. It can guide you in avoiding dificult situations. It can give you new ideas. It can save you a lot of time. So it is really important to seek and take feedback.
The most important and immediate source of feedback is yourself and the experience you have. The other is your team's experience. That is why when making a team try find people with experience, not neceserally conference or specific to whatever you do experience but life experience. Almost everything you do has to do with people so having people who know how people work is pretty important.
Another important source is feedback from past events. I read tons of blogs from people that attented past openSUSE Conferences. Finding what people liked and what they didn't is one of the best roadmaps you can get. I have to say here that before deciding to take over a conference is of high importance to make a research to see if you can actually do it.
Other than that feel free to bother people who organized great conferences you attended or you heard of. Never hesitate to ask anything, it is afterall the only way to get answers and feedback :D
Above all things try to stop what you are doing regularly and spend some time by asking people what do they think about what you are doing. I know perfectly well that time is really valuable but this is not at all wasted time. Have in mind that many times you will get feedback that you don't really like, meaning bad feedback that say that you are mistaken, accept it and value it. It can be a life saver if it comes from good source.
The feedback is something that is practically imposible to be finished in one(readable) post so I will continue with this at some other post. Afterall how the hll I will manage to fill 64 more posts?