Man pages matching name qwteventpattern in section 3:

QwtEventPattern.3.en	debian 10 / libqwt-doc
QwtEventPattern.3.en	debian 10 / libqwt5-doc
QwtEventPattern.3.en	debian 11 / libqwt-doc
QwtEventPattern.3.en	debian 12 / libqwt-doc