Courtesy of The Hurl website and checked with some other sources here's a list of Fall Pumpkin Chuckin' Festivals.
The big news is that the World Championships of Punkin Chuckin is moving from Delaware to Rantoul, Illlinois, November 1-3.
--------------------------------------------------------------------------------------------
September 2019
September 21-22
Punkin Chunkin Colorado
Location : Aurora, CO
Website : https://www.auroragov.org/things_to_do/events/punkin_chunkin_colorado
September 28
Burlington Pumpkin Pitch
Location : Burlington, WA
Website : https://www.burlington-chamber.com/events/
September 29
Vermont Pumpkin Chuckin' Festival
Location : Stoweflake Resort, Stowe, VT
Website : http://vtpumpkinchuckin.blogspot.com/
--------------------------------------------------------------------------------------------
October 2019
October 12
Howard County Punkin Chunkin Fall Festival
Location : Howard, PA
Website : http://www.howardfire.com/punkin--chunkin--fall-festival.html
October 18
Last Fling Pumpkin Sling
Location : Picatinny Arsenal, NJ
Website : http://www.pumpkinsling.com/index.html (It should be noted that this looks to be a schools-only competition)
October 19
1000 Islands Punkin Chunkin
Location : Clayton, NY
Website : http://www.1000islands-clayton.com/punkinchunkinclayton/
October 19
La Jara Smash Fest
Location : La Jara, CO
Website : https://www.facebook.com/La-Jara-Smash-Fest-227614161319293/
October 19-20
Great Pumpkin Fest
Location : Union Grove, WI
(their website has not updated with this year's dates yet, still looks like its on)
October 19-20
Clay County Punkin Chunkin
Brasstown, NC
Website: https://www.claychambernc.com/alpha-pages/punkin-chunkin-2018/
October 25 (??, yes, currently says on Friday)
Pumpkin Chuck Dayton
Location : Riverside, OH (National Museum of the USAF)
Website : https://www.facebook.com/PumpkinChuckDayton/
October 26
Route 66 Punkin Chunkin
Location : Vinita, OK
Website : https://vinitaareachamberofcommerce.wildapricot.org/event-2892515
(site has not yet been updated with the 2019 date)
--------------------------------------------------------------------------------------------
November 2019
November 1-3
World Championships of Punkin Chunkin
Location : Rantoul, IL
Website : https://www.punkinchunkin.com/
November 2
Pumpkin Blast
Location : Meridianville, AL
Website : http://www.pumpkinblast.com/
November 2
Discovery Cube Pumpkin Launch
Location : Fullerton, CA (Cal State Fullerton campus)
(site not updated yet, but they have confirmed to hurlingforum)