одним прекрасным днём мы с друзьями собрались пойти на музыкальный фестиваль, погода в те дни была замечательной, поэтому мы даже не думали, что всё случится настолько ужасно.
one fine day, we gathered with friends to go to a music festival, in those days the weather was wonderful, so we did not even think that it will happen so badly.
one fine day we gathered with friends to go to a music festival in those days, the weather was great, so we never even thought that everything happens so terribly.
One excellent day we with friends gathered together to go to the music festival, the weather in those days was great, so we do not even think that all happens so terribly.