Meaning of いろいろ in Japanese

色々と有り難うございます。忘れないように彼はそれを書き留めた。
Thank you very much for everything. He wrote it down lest he should forget it.

本当は土曜日からの予定が、いろいろあって週明けからってことになった。
It was going to be from Saturday, but, with one thing and another, it ended up being from the new week.