Dancing

What type of music should be played to facilitate a fun, party-like atmosphere to a wedding with a family who doesn't normally dance?

If many of the guests have a certain ethnic background, perhaps some music typical of that country would break the ice. Also, slower dances may tend to entice some of the older couples to dance (unless they are used to Polkas, etc.). If you have a DJ or Master of Ceremonies, they can work the guests and invite them to dance. Familiar songs may also do the trick. A DJ will have suggestions.

You may also get the help of the people in your wedding party. Ask them to mix-it up a bit and ask various guests to dance with them. This also applies to the bride/groom. Very few people will refuse to dance with the bride/groom if asked. And, once there are several couples on the dance floor, some of those people who may be shy to dance, may then join in.