I was thinking this as well. A lot of seasonal events at those parks have been going for 10+ years with some barely seeing big changes since 2020. While those events change up their menu items and entertainment offerings, I don't think Cedar Fair/Six Flags have seen much reason to change up event offerings like that — especially under their "the status-quo is fine" era. This will be Grand Carnivale's 6th year (skipping 2020 and 2022), the Food & Wine Festival's 3rd year, and Star Spangled Nights is being made into a week-long celebration. Carnivale definitely needs something to revitalize it, but if this is indeed the event's last year then I hope we'll get something new and improved in 2027 that isn't just a cookie cutter event already found at other parks.
The fact that Halloween Haunt, Tricks and Treats, and Winterfest are not yet shown on the events list does worry me. Carowinds and Cedar Point both posted their entire 2026 festival calendar while some other parks are in similar situations to Kings Island. I don't think this is a sign that those events are cancelled, it just upsetting that the park hasn't released the information in (what I'd consider to be) a timely manner.
Comparing the 2026 events list to the 2016 list, then yes it is indeed smaller. On this day in 2016 Kings Island had the following events posted to their website:
(* exclusive to Gold or Platinum Passholders; ** exclusive to enthusiast club members)
Opening Day (4/16)
Banshee Brew Festival (5/06, 5/07, 5/13, 5/14)
Exclusive Night Rides for Banshee, The Bat, and the Blackout maze* (5/13)
Coasterstock** (5/20-5/22)
Soak City Gold Pass Preview* (5/21, 5/22)
Memorial Day Weekend Free Military Admission (5/27-5/30)
Food Truck Festival (6/03-6/05)
Dive-In Movies (6/03, 6/10, 6/17, 6/24)
JDRF One Walk (6/04)
Exclusive Night Rides for Diamondback, Woodstock Gliders, and Woodstock Express* (6/16)
SpiritSong (6/23-6/25)
Fourth of July Holiday Free Military Admission (7/02-7/04)
Sundaes & Slides* (7/03, 7/10, 7/17, 7/24, 7/31)
Exclusive Night Rides for Racer, Monster, Scrambler, and the Grand Carousel* (8/11)
National Roller Coaster Day (8/16)
Fire and Safety Days Free Admission for Active Fire and Police (8/26-8/28)
Glow Run 5k (10/21)
Run & Ride (10/21, 10/23)
Compared to the current 2026 Events calendar:
Perks & Play Season Passholder Preview* (4/17)
Opening Day (4/18)
Soak City Opening Weekend (5/23)
Food & Wine Festival (Fri-Sun 5/29-6/21)
Star-Spangled Night (7/4)
Grand Carnivale (7/18-8/02)
Something I just noticed while typing this up is that the week-long Star-Spangled Nights event has been quietly updated to only be one night long on July 4th. I thought that kind of thing would've been important to get right before publishing to the website, but apparently not.