Babysitting a vast age group tonight?

I'm babysitting tonight and usually I'm pretty good about it but tonight I'm watching two 3 year olds, a 6 year old, two 8 year olds, and a twelve year old. The age difference is so big that I'm not sure about what kind of activities to do that will keep them all interested. If you have any ideas for things for us to do let me know!!