Xbox Wire: “Get your Proton Packs ready, because Rocket League is bringing Ghostbusters to this years Haunted Hallows event! Starting tomorrow at 9 a.m. PDT (4 p.m. UTC), complete Event Challenges to unlock items inspired by the iconic comedy, and enjoy spooky Limited Time Modes!”
Source: N4G PC Rocket League's Haunted Hallows Limited Time Event Celebrates Ghostbusters – Xbox Wire