A great way to get some valuable feedback for your event is through a survey. Putting together some questions that you would like some feedback on and sending it out to your mailing list and stakeholders is a good place to start.

One issue however is the response rates to this method which are for the most part low. Ways around this...offer some incentive or draw to entice people to send it back...and set a deadline to complete it.

Or, you can do like the folks at www.eval.me and tie a charitable donation of the respondents choice to the survey. Great idea and you can feel socially responsible while you're at it!