After parents' day on Sunday, there is a parents-only meeting.
We introduced ourselves one by one at a church on Sunday.
On Sundays, I do things like play tennis and eat ice cream with my girlfriend, Salmon.
This is a day of the week. You know this because it has 曜日 in it. But what day of the week is it? The Sun day of the week is Sunday. Doesn't get much easier than that for you. Lucky!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 曜日 as well.