my first wedding was at our church and both our families were there...my dad walked me down the aisle
my second wedding was at home with just our closest friend and his wife/kids in attendance...my teenager "stood up" with my husband and our younger son stood by me in front of our rock wall/fireplace at home....no other family was there and with the cost of travel in Alaska, prohibitively expensive anyhow....we said we'd have a big reception during the summer but we never did and no one ever mentioned it again
if my father (who is still alive) had passed away, I would memorialize him like someone above said by carrying something to remember him by as I walked down the aisle or however we arranged that....my dad and I have a lot of silly childhood songs, Czech songs and other inside family "traditions" that I would also incorporate in some way