に際し（て） (ni-saishite): On the occasion of; when
～に際し（て） (ni-saishite)
Meaning
On the occasion of; when
Formation and usage
N／V dictionary + に際して／に際し
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Used for significant occasions or starting points, often in announcements and speeches.
Examples
会議の開催に際して、皆様のご協力をお願いします。
On the occasion of holding the meeting, we ask for everyone's cooperation.
試験の開催に際して、皆様のご協力をお願いします。
On the occasion of holding the exam, we ask for everyone's cooperation.
研修の開催に際して、皆様のご協力をお願いします。
On the occasion of holding the training session, we ask for everyone's cooperation.
発表会の開催に際して、皆様のご協力をお願いします。
On the occasion of holding the presentation event, we ask for everyone's cooperation.
面接の開催に際して、皆様のご協力をお願いします。
On the occasion of holding the interview, we ask for everyone's cooperation.
How related patterns differ
た上で requires a prior step; dictionary form plus 上で sets an activity's scope. 最中に means in the middle, while 拍子に often triggers an accidental result. に先立って precedes an occasion; に際して introduces the occasion itself.