We host our Dads & Donuts/Moms & Muffins events as a "give back" and do not charge or expect to make money. We do put out a donation jar and it's always fun to compare how much the Moms donate vs. the Dads, with the Dads always...ALWAYS donate more money by the hundreds! We send flyers out two weeks in advance, then the next week and the day before as our school sends a folder home every Tuesday w/info/flyers for the parents to look over. We simply call it "Dads & Donuts" but also say "Students get to bring that special lady/man in their life and enjoy muffins, coffee, and juice compliments of XXX PTA." We have the event in the multi-purpose room for an hour before school starts which usually works well with working parents who still have time to get to work. To try and increase parental involvement we always have our volunteer sign up sheet handy and usually have a membership table w/a drawing to win a school logo shirt for signing up to be a member.
Regarding supplies: Our local McDonalds will donate coffee if we have a container which we never do as finding and transporting that much coffee proves difficult. Our local Panera bread sells coffee in handy vessels and they deliver. They also offer all the condiments to go w/coffee. Cups, REAL 1/2 n 1/2, artificial and real sugar, stirrers, etc. We purchase milk & orange juice from Costco as well as the really small cups (milk/juice), napkins, small plates. The super small cups are perfect, you'll think their too small but they really are not. A lot less waste this way.
We have never had a failure. It's always very well attended. On occasion we have had them bring a book to read but keeping it simple works best.
We also have a nice and polite sign display stating: Be kind do your neighbor and just take one...or something to that extent. Only a handful ignore. We have rarely had any left overs and order 70 doz. donuts! We came to this amount through a lot of trial and error. We have run out, just make note and order more next year. Most parents are understanding with only a handful that complain and are they type that are never happy with anything.
Also, for Moms & Muffins we buy from Costco and since the muffins are so large we cut them in half and it's the perfect serving size. You can cut right through the plastic covering then just wrap once w/more plastic and they stay fresh. We do this the night before to save on having to be at school two hours before.
Oh, and we print the flyers half sheet to save on costs. We have found that trying to get parents to commit w/a RSVP doesn't work very well. They just want to show up. There are ALWAYS parents who say they never new anything about the event, never received any info on it etc., even though we sent home notices three separate times. There are always those people and you learn to politely deal with them.
Lastly, (long post!) we spread out as many donut boxes as our large cafeteria table (or we use the cooler boxes in the cafeteria) with as many boxes at it will hold and adjust as necessary as the hour goes by. We have several volunteers stationed to help select, pick up if they can't reach etc. Two to three volunteers to pour & keep filled the juice & milk, and just one person to oversee the coffee. Don't congest the coffee area. You'll get backed up if you don't have the creamers on a separate table next to the coffee. We also have a volunteer to greet at the door and hand out a plate, which makes it go so much smoother & faster! Btw, sadly it is usually our own children who are the volunteers. Getting help is not easy!