This update introduces Special Events to custom (workshop) maps, you could see examples of Special Events throughout the official maps, such as in Cysmix - Peer Gynt where the two circles collapsed to one creating special gameplay, or visual effects in maps like Camellia - Ghost.

Full list of special events:

• Flash Event
  
• Fadeout Event
  
• Special Size Event
  
• Scale Circle Event
  
• Hidden Notes Event
  
• Background Gradient Event
  
• Audio Band Event
  
• Chromatic Abberation Event
  

Be sure to report any bugs over at the discord.