Happy Race Week!
Here's a trick for keeping hair accessories in... fishing line and a craft (large embroidery, not sharp) needle. They sell the needles at Joann's, Michaels, etc... look in the embroidery isle.
And then "sew" the accessory into your hair (braid a little piece of hair to give it something to hold on to). I have to do this all the time for my daughter's ice skating competitions, since bobby pins are not allowed, and they receive a deduction if any hair stuff falls on the ice (it's a hazard since it can cause falls). Works really well. There has to be a
youtube video somehwere, but I haven't looked.