Thank you all for your help and input.
I wrestled with the date, time and location, and made what I thought was the best decision. I recognize that most people cannot afford to take a day off from work, but hope we can get a decent turnout anyway. With enough publicity I think we will - if we can get the publicity.
I wanted to do it in step with the rest of the 4/15 demonstrations, and in the end felt that doing something during or after the dinner hour would just not have the impact as a lunchtime rally.
Keep your fingers crossed, guys. My greatest fear is having just a handful of folks show up - or worse, more counter-protestors than protestors.