How to best handle Shows with hundreds of performances

We are about to pick up a new contract that involves sketch/improv comedy.... so it is basically just the same show done 4 times a week, every week. Of course each performance is different because it is improv. Has anyone handled a situation similar to this? On the webtix side of the equation I am worried that it would be difficult for an online buyer to select this show only to have a list pop up that is ten miles long making the selection process of a performance seem overwhelming just because there would be so many performances. I have considered breaking the performances down into "show months" or possibly performing a phased creation of performances having only 3 months of viable performances at a time, and then at the beginning of each month adding a new month of performances to the existing show. On the wintix side of the equation, I am worried about the parsing of massive amounts dates and information. If anyone has some thoughts about their experiences, please share.

I wouldn't worry too much about it. The calendar functions in Webtix will put the list of performances in an on-screen calendar. That will make things easier for the customers.
In Wintix, you can search for a specific date if the customer asks for that. If the people ask for a *range of dates* let us know. We have a free program, Mintix which is intended to sell that way.
As far as the "parsing massive amounts of dates and information" don't worry. MySQL can handle anything you can throw at it.