I attend two star parties most years, GSSP and CalStar, both in California and have never had any complaints about stray light from my EAA setup. As I have previously noted, I don't use a red filter because 1) the filter limits the amount of detail one can see; 2) I want to see objects in color. The second is most important. So, I set up well away from other folks except friends, use an EZUp with side curtains, point my computer away from the field and shield it inside a box. This works very well, but is not perfect.
Next year I plan to attend a star party I have never been at before. Perhaps the Okie-Tex or Oregon Star Party and I want to make sure I don't have any stray white light at all. I know that some people use hunting blinds to completely shield their computers. I have checked around on line but it is hard to tell just how good these are at shielding light until I try it out in person. I have heard that some can leak light through the sewed seams.
I would appreciate any input from those who have used or seen hunting blinds used. The first priority is to be light tight. Durable is a close second.