Chauffer, you shouldn't have a problem getting tickets for those nights, at least not yet! The Kennedy Centerís online system lets you chose the section you want to sit in and then tells you exactly which seat it is offering you. The only problem with using the system is if youíre picky about exactly where you want to sit (like me). I like to be in the first row of the balcony, even if itís on the side. But the online system assigns center seats first, so it may show me D103 when Iíd rather have A15. In that case, itís better to call the box office where you can specify what you want and be told about everything thatís available.
The box office opens at 10 AM. If you are willing to make a $60 donation to the Kennedy Center you can buy your tickets NOW because Kennedy Center members get a 10 day window before single seats go on sale to the public. Thatís what I did, I ordered my tickets on 3/31, and got great seats. Good luck!