Evening
The evening radical and the evening kanji are the same. If you know the radical you know the meaning of the kanji.
Do what you're meant to do. Study those radicals!
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ゆう
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The evening is when all the youths (ゆう) come outside to play.
Young people love staying up the entire evening doing youth-people things, and it's really obnoxious for us curmudgeonly folk. Note: All the ゆう readings will use the word "youths" as a keyword for the mnemonic, so bear that in mind for any future ゆう reading you'll encounter.