Here's my best advice - now this may sound like I have no shame - but what has always worked for me so far:
When I contact someone either by phone, email, in person I ALWAYS start off with
"I am calling (here, writing, etc) because my daughter has cystic fibrosis"
Almost no one will cut you off. If you say "I am calling to raise money and awareness for CF" you will hear a dial tone on the other end.
When you tell someone that this is your child, your friend, your family member that is affected - almost no one will have the guts to tell you to get lost.
Good luck with it all. Our team raised 12,000 last year.