So I'm running a campaign that revolves around a magic circus. The circus itself is cursed, but it doesn't seem that way at first. (and two of my players work at the circus). The first few days at the circus should seem normal, if not for a few strange things happening in the background. 

I need games and activities that will keep everyone engaged and interested in learning more about the circus itself. I am taking a lot of inspiration mecanically from the feywild, and the creatures are based heavily on scottish fairy and folk tales. Any Ideas?

If you haven't already, acquire The Wild Beyond the Witchlight adventure. It has an entire chapter dedicated to exploring a feywild-themed circus, including carnival games and fun circus experiences. 

My only issue with Witchlight is that it's expensive, and I'm super broke. (I run a Highschool dnd club)

I would argue that $30 is probably what would be "in budget" for high school, but I don't know your situation. Sadly, I can't snip out a whole chapter and post it here, or direct you where to look elsewhere online for access. 

Here are some

Activities

Fortune teller

A small dimly lit tent stands at stark contrast to the bright lights that surround it. A single candle can be seen behind the curtains at the entrance, flickering slowly as if beckoning you to come closer.

Inside of the tent is an individual in an elaborate yet unkempt cloak which obscures their face. They say nothing, gesturing the players to sit at the table before them. There are exactly enough chairs for the party. In exchange for 5 copper, this fortune teller will read the players fortune by pulling from a deck of cards they don't recognize. The cards can be anything, but the depictions of the cards should have people eerily similar to them on the faces. The prophecy on the card can lead the players in any direction you want them to. For example, if you want the players to attend a specific game, make that players card depicting success in front of that game. 

Freak Show

You walk by a large tent, in front of which is a well dressed half elf who flashes you a smile. He calls you over, promising you sights and sounds beyond your imagining. 

If you want a more sinister and cruel tone for your carnival, you could have a freak show. For a couple coins, a man could walk you through a group of humanoids afflicted with deformities. Goblins with eyes dotted across their bodies, seemingly ordinary people who vomit spiders or fire on command, and blind beholders could be inside. Perhaps these "freaks" seem uncomfortable and unwilling to talk about their situation, hinting that they may not be here on their own will, perhaps even becoming this way on the behalf of the carnival.

Carnie Games

As for regular old games, you could just take ones from real carnivals and put a magical twist on it. For instance, don't have regular ring toss, do that toss, where you have to throw a large pointy hat on a bunch of gnomes or other fey who run around frantically inside the pen. 

I have a BBEG named Virsio who is a demented jester that loves chaos. He runs a circus show, and his favorite phrase is "I'm helping end world hunger by ending those who are hungry!" He made a language named Jerry, and owns a humongous soul-trading underworld.

Soory that the above post makes no sense, but what I meant to say was that I have some good ideas for circus games.

Read Something Wicked This Way Comes by Ray Bradbury. This is one of my favorite books and is all about a haunted circus. 

A human statue that has forgotten how to move.

A fortune teller completely covered from head to toe with body piercings. If you convince her to remove the piercings and rings that cover her body you will find nothing at all under the layers of metal. 

Deep in the hall of mirrors lurks a killer. It is unbelievably tall and skinny and its form shifts and ripples with contortions as it stalks through its reflective maze. When the players encounter it they end up just shattering mirror after mirror as they try to hit the monster and once enough mirrors have been shattered all that is left is a very small, very fat man with stubby arms and legs who used the mirrors to change his shape so that he could commit his crimes. 

A man who breathes fire. He needs fire to breathe. Everyone watches him do his daring tricks of inferno but in reality he is desperately breathing in the flames to survive.

A dingy cage off in a forgotten corner holds the bone-thin starving man. His act is not eating. So far he has gone thirty days surviving off of nothing but dew drops and the rain. Though he will admit shamefully that he ate a cricket four days ago that ventured inside his cage out of desperation. That is his greatest sin in his eyes. Betraying his act in such a way is unthinkable.

The Man Who Has Never Set Foot On The Earth.  A simple man stands on a stool. From the day of his birth he has never set foot on the ground. 

Several of the freaks in the show could be the people who found out about the circus's secrets. They get their bodies twisted and warped, their minds wiped, and they are stuffed in cages to entertain the masses. 

One of the shows is the flea circus. It looks like a normal circus show with clowns and horseback riders and acrobats but when the magic is stripped away you see that all the actors are grotesque, giant fleas that will try to suck your blood. That's when you flee the circus. 

I absolutely adore these!! Thank you! They fit the "fun on the surface" vibe really well

Idea: there is a knife thrower who is actually trying to kill people.

Shameless, self-promotion alert!

I created a circus/carnival for my players a while back. There's a list of games and how the player characters can figures out the 'tricks' behind these rigged games. Hopefully it helps: Circus - Fantasy RPG Session Plan

I'd also highly recommend taking a look at the Pathfinder 2e The Extinction Curse adventure path. It's got some great ideas that are fun to steal.