[TYPO3-calendar] Filtering events by a string

[Markus]

Hi,

I have connected an external Google calendar to cal.

In each event is an information stored in the header of the event, e.g. 
"(US) Heilige Messe (Pfarrer Müller)" that I want to filter for:

e.g. I want to show only all the events with "(US)" at the beginning. Is 
there any possibility to modify the WHERE clause which selects the cal 
event records to be displayed?

I want to filter for different strings in each cal fe plugin I have put 
on my webpage.

Do you have any idea?

Thanks,

Markus