What to do if your dad is no longer here?

So, I was SUPER close with my dad, I mean the epitome of a daddy's girl. He only has two daughters and I'm the first born, so... you get the picture. He had a vision of my wedding day from when I was a little girl, walking me down the aisle and us dancing to 'Alison' by Elvis Costello (he named me after that song). Buuuuttt, like most well laid plans, something always goes wrong. He passed away before my wedding day could happen. It was a sudden, unexpected thing, and to be honest even though it's been 6 years, it feels so fresh.

Anyway, my question is, if your dad is no longer here, what did you do regarding all of the father/daughter traditions on your wedding day? I have the walking down the aisle covered, but as far as the parent dances go, I'm at a loss. I don't want to scrap them altogether, since I don't want to take any of the specialness of the day away from FH and his mom, but I also don't want to be bummed out on my wedding day. My little sister (she's 19) is insistent that I do SOMETHING. I don't have any other male relatives that I'm close to, and really even if I did, they're not my dad and it wouldn't be the same. I also have the best step-mom (I lived with her and my dad growing up, not my mom) but since I do also have a mom, I'm not comfortable just picking one of them to dance with and I feel like that would be awkward anyway. So, if anyone has been in this boat before, any advice would be great!! Thanks girls!