info,  I second what qbteachmt says above.    Classes allow you to view your data in broad strokes, but are not advisable for events...where over time you might have 100's of them.  Customers and Jobs (which can further be filtered by Customer type and Job type) are designed for tracking your events.

For non-profits (NFP), schools, etc., Classes can be used to manage fund accounting.

As qbteachmt says, take a look at the various report options and you'll see some of the benefits of classes vs customers:jobs.  For example, some reports can break out your data with Classes as the columns... and a grand total column on the right... but with customer:job groups and subtotals down the page.  So, just for an illustration supposing that you produce concerts... maybe the Classes would be Hip Hop, Drum and Bass, Classical, and Fundraiser ...  maybe you only use a handful of specific venues... then you might want Classes for each venue, with the customer:job reflecting what happens in the venue.

Anyway... take a look at some of these pages and videos on the QuickBooks for Mac "Little Square" site to see if they give you some good ideas for organizing your data:

<a href="http://www.qblittlesquare.com/2011/06/adding-some-class-use-classes-to-categorize-your-data/" rel="nofollow" target="_blank">http://www.qblittlesquare.com/2011/06/adding-some-class-use-classes-to-categorize-your-data/</a>

<a href="http://www.qblittlesquare.com/getting-paid/customers-and-jobs/" rel="nofollow" target="_blank">http://www.qblittlesquare.com/getting-paid/customers-and-jobs/</a>

<a href="http://www.qblittlesquare.com/2011/05/get-more-insight-with-customer-and-job-types/" rel="nofollow" target="_blank">http://www.qblittlesquare.com/2011/05/get-more-insight-with-customer-and-job-types/</a>