According to a recent Disney blog update addressing their seasonal events, Walt Disney World announced the cancellation of Mickey's Not-So-Scary Halloween Party for this year.
"While assessing another fall special event, Mickey’s Not-So-Scary Halloween Party, we determined that many of its hallmarks – stage shows, parades and fireworks – are unable to take place in this new, unprecedented environment. With that in mind, we have made the difficult decision to cancel this year’s Mickey’s Not-So-Scary Halloween Party. Additionally, Disney H2O Glow Nights, the nighttime special ticket event at Disney’s Typhoon Lagoon, will not take place for the remainder of 2020. Guests who have already bought tickets to these events will be assisted with refunds over the coming weeks."
As you can see in the statement, H2O Glow Nights at Disney’s Typhoon Lagoon will also be canceled for 2020, and refunds will be available for those event tickets.
Along with those cancellations, the park outlined a "modified" EPCOT International Food & Wine Festival. It will be their longest fest yet, beginning on July 15th. The "Eat to the Beat Concert Series" will not be a part of this year's festivities.
In regards to the winter events including Mickey’s Very Merry Christmas Party and the EPCOT International Festival of the Holidays, they will keep monitoring whether those are able to happen later this year.