Just a few random comments...
I have heard others complain about Ruthie's recent UK performance as Velma, which I didn't see, but I have to say when she did the role on Broadway in 1999, she was terrific. She was in great voice, with a very sassy and sexy characterization...not as much of a Fosse dancer as Bebe Neuwirth, of course, but I really thought she gave a very solid performance. One of my favorites.
No, in Chicago understudies don't usually do the matinees (which is sometimes unfortunate!), the principals are usually contracted for eight shows a week - the only person in recent memory who didn't do all the shows was Jennifer Holliday as Mama Morton. So I'm assuming that Marti should be in. (It's just that if someone is going to call in, it seems they are more likely to do so for a matinee than an evening performance, for some reason.)
And finally, when I saw the show at the end of July, the Sprint announcement was still there. It alarms me every time.
"I cried during the Frug." - MC