I don't want to let my friends down

Question

_{This is an entry into the Fortnightly Topic Challenge #36}

I was supposed to do something, but I can't remember what it was. I know it was supposed to be fun or funny. In a typical effort to hide my plans from my friends, I made a word search that was scrambled using a Keyword Cipher. It seems; however, that I've forgotten what the Keyword was. I know it has something to with roll, but that isn't it. Rock and roll? Sick role? Kick and roll? Duck roll? Maybe you can help me remember. I do remember the keyword is a four letter word.

K Y X L I P K R K W O C E A T
D I E E L D U R L Z S R S H T
Q B T Y K D B Z M M J P Y Z L
F S S B K U O R D M P Z H I X
M A V A Q F Z U K L N E O O M
U U D E N G B M G Z B D U Z T
F F Y Z A C M I O H U A R O I
O I X N Q I P H A E V A K S L
Y A F V J F U K V A B F A A B
E X G G W V J N F N R N G Q T
R J A E O C F N D B U Z S E N
Y L Y J D A P H W B J Q Y I D
R P N F E S C W B T K U X I U
J L Y F P P E E H Q K G R G H
O C X Z C U N Y A R W Q Y R X

What activity was I planning to do with my friends?

Answer 1

You planned to

RICKROLL your friends.
That's why your plans are secret, as rickrolling requires deception.

Using the key:

RICK

produces:

dyxmbqdadwpchet gbhhmguAmzsaskt rftydgfzNnlqyzm issfdupagNqzkbx NEVERizudmOhPpn uughojfnjzfGUzt iiyzecnbpkueapb pbxorbqkEhvedsm yeivliudVefieef hxjjwvloIoaojrt alehpcioGfuzsho ymylgeqkwflrybg aqoihscwftduxbu lmyiqqhhkrdjajk pcxzcUOYeawryax

Words found:
NEVER
GONNA
GIVE
YOU
UP(ambiguous?, could go up+right instead of straight up)

Also fits the title:

"Never gonna give you up. Never gonna let you down"