Games can be fun & enjoyable at just about any celebration. Just make sure that you & you clients have talked about them prior to you doing them.
I have mixed feelings on games & their importance as to the success of a night. I think for the right party they are great & may enhance the experience of all. On the flip side some times the can "slow down the night" as now you just got every one dancing & now you are asking them to stop & form teams...
I'd say get some games together & offer them in one of your packages. Call it the Game Nite Package or what ever you'd like (it would consist of DJ music & several games to be played in a row or spread out- your call depending on how the party is going & the crowd). To do games successfully at an event it's good to have a close-nit group, other wise you will find it hard to get people involved (find this out before you offer the "Game Nite Package").
When it come to which games to use, make some up- use your imagination. Just don't make them too complicated.
As for line & group dances, my wife leads them
!
When it comes to talking on the mic, I'd say talk as much as you need to. In other words if the crowd needs more encouragement talk more & if the are dancing allot you don't need to talk as much.
One pointer I'd give is if it's a hard crowd- keep on talking & keep it positive. NEVER make it seem like you are defeated & never on the mic put down the crowd for not dancing. A crowd is very much like the jury at a trial. Some juries are great for your cause & some aren't. Every group is different. Lastly I'd like to say compliment your crowd if they are dancing. Say things like- "great job dancing out there" & "we got some great dancers here tonight".... (I typically compliment the crowd 3-4 times during the night). This makes them feel good about them selves & in turn keeps bringing them back to the dance floor, because they now associate the dance floor with positive feelings.