IMHO it is not a memory problem: I suppose the script generates an endless loop and this is causing the memory problem.
Well, “out of the ordinary” … I doubt that an “ordinary” WP installation exists (as long as it is not a real trivial site) …
Currently active plugins:
All in One SEO Pack
Cimy User Extra Fields
Better WordPress Minify
Custom Post Limits
Executable PHP widget
Fix Rss Feeds
Google XML Sitemaps
KB Advanced RSS Widget
Lightbox 2
openxwpwidget
Post Snippets
Quick Cache
Smart Youtube PRO
Events Calendar (yours)
TinyMCE Advanced
Widget Logic
WP-CleanUmlauts2
WP-DBManager
WP-SmugMug
WPtouch
WP Widget Cache
Cheers,
Alex