I know for certain that I will have my Pinkie Pie-rate costume at DragonCon this year, and as long as there aren't any conflicts, will probably go to the "All the Pinkie Pies" photo shoot with it.
But, all told, I will have 2 MLP costumes: Previously mentioned Pinkie Pie-rate, and likely the Discordia (Grecian inspired genderbend of Discord). My husband will be bringing his Mage Twilight Sparkle genderbend costume, which matches in style to my Pinkie costume, and most likely the Roman inspired Celestia genderbend, which matches to my Discordia.
Still have no clue what days we are wearing what, since it is going to depend on photoshoots and panels for other costumes.
Convention Line-Up: Dragon*Con 2016
Scarlet Witch (All New All Different Marvel), Jayna (Wonder Twins, Super Friends),
Fix-it Faerie (Original Design), 1950s Housewife Bill Cipher (Gravity Falls... ish)