Poll: Should I cancel this party?

I invited eleven of my old university friends round for a flat warming tomorrow evening. Eight people said they would come but now five of them have cancelled on me either yesterday or this morning. I get on really well with two of the three who are coming and fairly well with the third. Should I just go ahead and have a good time with the three people who can make it or rearrange the party for another day when more people can come? Or have the three round tomorrow and then do another evening as well? All the people who've cancelled had valid reasons and still want to come, they just can't do tomorrow anymore. What would you do?!