Thanks so much for your time and thoughtful response FarCityGuy.
Some of our families were concerned that there'd be so many people in red, it'd be harder to find their children in the Magic Kingdom. (Perhaps we're over-estimating the volume of red shirts in MK?) We only have one day (sat in MK) where all our families are wearing the same reunion t-shirt. I think our families are excited to be in MK for GayDays, and we're looking at additional ways to be visibly supportive such as rainbow pins, necklaces, etc.
Also, I'm surprised to read about the negative criticism, but perhaps I'm in a bubble of naive inclusiveness. Hearing that other parks may not enjoy as much "red support" on the other days, I'll plan to bring something red to wear. Love is love.
Thanks again, very much for your insights. We're quite excited to celebrate with you.