wystąpienie

From wystąpić + -enie.

Yeni

to perform, to play (take part in a performance)
to appear; to act; to work; to speak out (to speak publicly about something or take action in connection with it) [with z (+ instrumental) ‘in what’],
to apply (to make an official request for) [with z (+ instrumental) ‘in what’], [with do (+ genitive) ‘with whom’],
to lead, to step out (to leave to the front of some group)
to leave, to step down (to resign from some group)
to flood (of large amounts of liquid; to leave some container)
to appear, to show up
to demand
to appear (to show oneself publically)