Talk in Phoenix

I'm going to be speaking on "Market Failure: An Argument For and Against Government" at 11:15 A.M. on Saturday, February 3rd, at the Freedom Summit in Phoenix, Arizona.In the past I have put up notices like this for speaking trips abroad. Would readers find it useful if I made a general practice of announcing any talk I plan to give? Only the ones that are open admission (this one apparently requires a ticket)?