Tye a pre-cut piece ribbon around your head with blindfold on... except have to use "kitchen/rubber" gloves to do it with. Nurses would have an advantage though, lol.
Get caps from the dollar tree for $1 each...decorate them for the ladies as a remembrance of the party or have the goodies there to decorate them with...fabric paints, ribbons, buttons, foam cutouts, feathers etc. Ask them to wear them out sometime so others will look at them strangely and it can bring a smile to them to know why they have them on.
Use the "google" translator to find spellings for cancer/caps/hats/scarf in different languages. Make a word search using these words (free programs available to do it)
Make a bingo game *free programs also) using cancer words to make it fun.... cancer, chemo, hair loss, boobies, doctors, etc.