The event has been live seeing that October 15th, so optimistically you have had sufficient time to earn sufficient occasion currency to buy your favorite objects. If no longer, you have simply a chunk longer to grind out a few greater video games. Remember- you don't earn more or less Candy Corn via playing ranked instead of unranked playlists, and you could assume a median of 10-12 pieces in line with suit finished.
In my opinion, the Haunted Hallows objects had been some of the good event cosmetics in some time—and the Rocket League network ordinary appears to agree as nicely. Highlights from this occasion's objects are the conventional Arachnophobia decal, the Demolition Demon player name, and the menacing Demon Disc wheels.
Since Psyonix made the event's Golden Pumpkins tradeable, they appear to be trading 1:1 with keys on various Rocket League buying and selling sites. If you're close to RL Prices having sufficient Candy Corn, it is probably well worth grinding a few more suits for a Golden Pumpkin to change or open for your self.
Finally, your Candy Corn will disappear this Thursday, November 8 at 2:00 PM PST (5:00 pm EST). You wont be able to earn any more Candy Corn after these days, however Psyonix usually offers a short grace length after events for gamers to redeem the rest of their occasion currency.