We're heading up on the 6th as well. We were thinking that throwing crampons in is really not that much to carry, and could be essential for summiting depending on conditions. Better to have it and not use it. Plus, I bought a pair just for this hike and there's no way I'm dropping $150 on a piece of gear and not using it! Heck, I'll run around the parking lot in them just to use them if I have to.
