[Sumippi]

①"I will never forget the first time we met, on that breezy cool day."
②"Until then, I will wait til that day we meet again in spring."

①僕らが初めて会ったあの日のことを、僕は消して忘れ ない、あの、そよ風の吹く、涼しげな日のことを。
bokura ga hajimete atta ano hino kotowo, bokuwa keshite wasurenai, ano soyokazeno fuku suzushigena hino kotowo.
(The subject is 'boku(ra)' if you're a guy.)

私たちが初めて会ったあの日のことを、私は決して忘れ ない、あの、そよ風の吹く、涼しげな日のことを。
watashitachi ga hajimete atta ano hino kotowo, watashiwa keshite wasurenai, ano soyokazeno fuku suzushigena hino kotowo.
(The subject is 'watashi(tachi)' if you're a girl.)

②春になって再び僕らが会えるその日まで、僕は待ち続 けます。
haru ni natte futatabi bokuraga aeru sonohimade, boku wa machitsuzukemasu.
(Boku(ra) for a guy)

春になって再び私たちが会えるその日まで、私は待ち続 けます。
haru ni natte futatabi watashitachiga aeru sonohimade, watashi wa machitsuzukemasu.
(Watashi(tachi) for a girl)

Are you going to read these sentences on the stage? If so, I think you should also find out the 'intonation,' which is very important to make yourself understood in Japanese language. I'm sorry I don't know how to show it here.