Not sure if you saw this in the FFFC post, but I wanted to post it again. Also, not sure where you live in MD, but you should check out https://www.freeforallcupcakes.com/faq.html
They specialize in allergy free cupcakes. Maybe you could get them to do a cake instead?
Re: ***cantalopes***
I think they deliver too so you could try that option.