Anniversary, Memorial Day
noun
You should write down all your thoughts on this day, because it's not just any day — it's an anniversary! Wondering how 記念日 differs from 周年? 周年 is usually for a numbered anniversary, like 十周年 (10th anniversary), whereas 記念日 refers to the specific date on which a memorable event took place in the past.
きねんび
The reading is a combination of on'yomi for the first two and kun'yomi for the last one. That being said, all of the readings for all of the kanji are the readings you've learned already, so you should be able to read this word too. Just watch out because ひ is rendaku'd into び.
記念日には、彼とディナーに行く予定です。
I'm planning to go to dinner with him on our anniversary.
今は『サラダ記念日』を読んでいます。
I'm currently reading "Salad Anniversary."
今日は『ワニカニ様』の放送開始記念日です。
Today is the anniversary of the broadcast debut of "WaniKani-sama."