It's great it's for a good cause like that.
But that pony in the opening ceremony picture, it's G3 design...
Looks like it's the Pinkie Pie costume from the G3 MLP Live on stage show, "The world's biggest tea party".
I guess they just changed a few details to make her look more like the Twinkle Hope character. (As far as I know there was no Twinkle Hope in the live show)
All well I guess, the children won't mind or even know... And at least the 2D sign is G4 style.