Display the outlook calendar by category view, click on one entry, press
Control+A, then press Delete. Or Shift+Delete if you want to bypass the
recycle bin.

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Milly Staples [MVP - Outlook]
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After furious head scratching, EBMoore asked:
| There is a problem with the data in the CAlendar file, and I don't
| use it anyway. Everytime I open the Outlook file it adds new Holiday
| entries to each holiday. Have tried to delete but they go forever and
| I can't get to the end. When I try to delete the folder the mesage is
| that I don't have the authority when I'm the only one using the
| computer.