We'd need no less than a year's lead-time, so all the members and interested parties can be informed and arrange their schedules accordingly. Ads would need to be purchased in ALL the major gun publications as well. We'd also ned to establish a website and a strong internet presence on ALL gun-related websites and chatrooms to further spread the word.
Further, we'd need to bring the manufacturers in as well (hey, we're their customers) to offer sponsorship and help. Their employees would also add to the numbers. We could also bring in other groups not strictly progun, but sympathetic to our cause a a way to solidarity on Liberty.
Finally, having done all that, we would need to REMIND, REMIND, and REMIND all our people that if they want to keep their rights, they MUST show up and be heard.
Oh, and briefing in the major radio and Fox news commentators and talkhosts wouldn't hurt, either, nor the conservative commentators.
Invitations should be sent to anyone who is even nominally on our side in Congress or the executive branch, including the President.
It'd be tough...GOA and NRA don't usually work together well, and it'd be a major undertaking, but it'd be worth it to show the Left and the rest of America that we're not some isolated nuts, but a true cross-section of the country, and that we will not give up our rights so easily.