Here's why 6-7-8 is a terrible idea:
No matter what our actual intentions, any coverage we get on those days will be 100% negative. If possible, the media will flat-out ignore us, because the gay pride events have been planned longer, are more well-established, and could potentially eclipse our own march. If our numbers are too huge to ignore, the media will instead spin our march as a "counterprotest of bigots," simply because they can. You guys should know this by now! Even though we know it is not, anti-gay people would loudly proclaim our march as a protest of the gay pride events, and we do not have the media voice to disassociate ourselves from these kind of views. Remember, Ron Paul took a publicity hit just because a few racists and anti-semites like David Duke like him, even though he finds their viewpoints disgusting and his message is completely different!
In other words, 6-7-8 would be a HUGE publicity mistake. If people like me on this board can recognize this, you'd better believe that the MSM will also see this and capitalize on it in every way they can. They will inevitably frame our march as hostile competition to the gay pride events, even though we all know very well that it is not.
Also, trying to "merge" with the gay pride events and "convert" people to Ron Paul by subverting their own event is political suicide. It won't work, and it will backfire. Let the gay pride people have their own events in peace, without any "interruptions or distractions," which is how many (even most) people would view a simultaneous march.
Remember: Perception is everything. That's the primary reason we're doing this march - it's not just so we can let off steam and feel all warm and fuzzy on the inside.
Furthermore, to the people saying all schools get out in May:
Only colleges that are on the semesters system get out in May. Many are on the quarters system, and they get out in early June (I can't get to their academic calendar right now, but The Ohio State University is a good example). Furthermore, early June is very busy and hectic for them because of exams, graduation (for some), and packing up and moving back home.
June 21st is by far the best date all-around. Everyone is out of school, there's no baggage attached, it will be our own day to grab the spotlight, and it has great symbolic significance as the date the Constitution went into effect. If we pick June 21st, we will grab attention and pick up supporters. Even if the media tries to spin our march negatively, they will have far less ammo than if we pick another day - if we pick 6-7-8, the media will have a field day perverting the intentions of our march. The choice is clear.