Hi BB, .....First things first....**** BIG HUG****
We have had 4 close male family members pass away since March 2010, My OH's dad, my Brother and 2 of my Uncles ( 1 of which I've always been very close to). As we both only had a small families in the first place and due to 3 of these 4 being very sudden and unexpected it is still often difficult to deal with. Because of this we did original thought it was best not to do anything regarding "honouring" them all on the day as we thought other family members might find this upsetting but lately I've been considering lighting a single memorial candle at the beginning of the ceremony as a way of honouring all of them. But this might change again over time.
What ever you do your dad will be with you in your heart and that of others regardless.