Well, Harvey has never missed a performance so there is a very very good chance no matter when you see it you will be seeing him!
As for the show I know I usually have the easiest time getting Thursday night tickets for Hairspray. Now That has just been my experience but Tuesday should have the same chance. there are a few things you could do to get tickets. You can try before Tuesday to get tickets definitely try that first. But it you don't luck out you can go that day in the morning before the box office opens and wait you can then buy SRO tickets if you really want to see it. you can also so enter the raffle to try and win rush tickets they are in the last row of the Mezz. Have done bother rush and SRO and It's about the same in the long run. SRO you might have heads in the was and Rush your a little high up but you can still see everything. But you are taking your chance whit the raffle depending on how many people are there for the drawing they have 25 rush tickets a day and around 18 STO tickets.
But my suggestion if you really want to see the show and can't get the tickets in advance you should go early before the box office opens and stand in the cancellation ticket line as soon as they open the doors. If you are in the front of the line when the box office opens you have a really good change of getting ticket. That is how I ended up getting a ticket in Row G orchestra for Marissa's last show. You need to have $100 cash with youto buy the tickets. They always have a long line for cancellations but I know at least the first few people almost always get tickets. A lot of time they are selling cancellation tickets up until the show starts. But if you get there early then you can get it over with and do other things with your day.
Grace: My love for you is like this scar (points to elbow) ulgy but permanent!