One person is contributing two sets--one from her daughter, and her extra set isn't included in the total, so don't forget to count her.
And thanks for adding the total count so we don't have to keep counting each person who signed up.
These do go really fast! I have zero experience in triangles, and after doing a couple practice ones, I got 22 done on Saturday, and plan to do one for each person signed up.
On the little triangles that get trimmed off: I read a suggestion somewhere to sew another seam 1/2" from the first one, then cut between the two, and voila, a ready-made HST! So now I have a little pile of those, too.