A longed-for thing or event is one that someone wants very much.
...the wet weather that prevents your longed-for picnic.
ADJ : ADJ n
LONGED-FOR
Meaning of LONGED-FOR in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006