Condolences to you and your family Silver Flute. I've been to many funerals. I think there are a few questions worth asking:
-what made your dad laugh? Is there a way to incorporate this in his special day (because this is his special day)
-what was his favourite colour? Can everyone wear it or have the flowers or other special things in this colour?
-did he have a favourite song? Do you think he would have liked it played or would he prefer to funk it up a bit and have everyone sing it?
-did he have a favourite food or pub? Would it be a good idea to incorporate this into his wake?
-did he have a passion for a particular charity so instead of flowers people could have the option to give to the charity?
-was he a passionate sports team follower? Would he like their flag draped over his coffin?
Lots of ideas but you know him well so think like him. As his physical bodies last day on earth, what would represent his life form the best?
Hugs. I imagine this is a difficult time.