Man pages matching name sd-event in section 3:

sd-event.3.en	debian 10 / libelogind-dev-doc
sd-event.3.en	debian 10 / libsystemd-dev
sd-event.3.en	debian 11 / libelogind-dev-doc
sd-event.3.en	debian 11 / libsystemd-dev
sd-event.3.en	debian 12 / libelogind-dev-doc
sd-event.3.en	debian 12 / libsystemd-dev