hiː hɐz ɹˈɪʔn̩ ðˌɛm ɐ nˈoʊt ɛksplˈeɪnɪŋ ðæt hiː ɪz ɡˌoʊɪŋ tə ðə hˈɑːspɪɾəl fɚɹən ɪmˈɜːdʒənsi ɐpəndˈɛktəmi ænd ðæt ðeɪ ʃˌʊd sˈɛləbɹˌeɪt wɪðˈaʊt hˌɪm.
He has written them a note explaining that he is going to the hospital for an emergency appendectomy and that they should celebrate without him.