You are very thoughtful to host a party for your neighbor! To me, breakfast food sounds more difficult than what we usually do. Eggs and other breakfast foods taste really good when hot, but rubbery and hard after about 10-20 minutes, and in my opinion, wouldn't taste very good if cooked in advance. I think it would be less stressful and easier to prep cold foods ahead of time and put them over night in the fridge.
Typically, when I have parties around lunch time, I think sandwiches, potatoe salads and fruit salads, finger foods such as cut up veggies or fruits and chips that can be out in serving containers, maybe a punch bowl and coffee.
Many times I will go to Sam's Club and buy their premade sandwich rounds, bags of chips or precut veggies, and salads such as potatoe salad that come in a container to be scooped out.
You could also do finger sandwiches, such as cucumber salad sandwiches that are very easy (and inexpensive) to make ahead of time.
Or I've picked up a pack of croissants and a container of chicken salad and made chicken salad sandwiches that way.
If you don't have a Sam's or Costco membership, you can find good inexpensive party food at Wal-Mart, too.
If you have a punch bowl, punch is also extremely easy to make. All you need is a quart of sherbert, ginerale and cherry 7up. Put the sherbert down the bottom and then add the liquid on top. Good luck!