Here is a tip: Have you heard that many venues will release tickets to a performance a week before the date of the show? These tickets frequently come from group sales and whichever blocks of tickets are being held for the performers friends and family etc. Often there is another final release of tickets frequently some really good ones just one or two hours before the show is set to start. Of course it is nice to be able to plan ahead and knowing that you have early access to tickets during a presale is the best way to be absolutely sure you get tickets to the show.