"ghostlight is incorrect and Kelli was not sick. Those absences, whether announced or not (I have no clue), were planned personal days. She was out-of-town for a family wedding. She'll be back in for the next performance. She is fine. "
No reason why she can't be sick and at a wedding. 
"Ghostlight.... Who were the seven cast members out on Saturday please?"
Ms O'Hara, of course, (and sorry, I don't know all the names) the young prince, the English Ambassador Edward, the slave Eliza (from the Uncle Tom ballet), Topsy (from the Uncle Tom ballet), Lun Tha....aaand I'm blanking on the 7th, but I think it was actually Uncle Tom (from the Uncle Tom ballet).
I would agree with those who said before me who say the play's the thing, though. I've seen Kelli in many things, and she is excellent - but Ms Leaming (thanks for the name, bwayphreak234) is also very good. There were times I forgot she wasn't Ms O'Hara, though they do have a slightly different take on the role.
If this is your only chance to see the show, I'd recommend you see it no matter who is in or out.
There definitely exists somewhere a site (maybe on Facebook?) that lists Kelli's scheduled absences. Maybe someone here has it?
Updated On: 10/20/15 at 10:10 AM