Forza Horizon 6 has launched its latest in-game event, Series 4, titled "Horizon Mascot Party." This event follows previous celebrations of Japanese cars, motorsport history, and Italian automobiles, shifting focus to the game's recognizable mascot characters spread across the map. The "Horizon Mascot Party" series will run for four weeks, with each week presenting a new playlist of activities and rewards.

The "Horizon Mascot Party" series commenced on August 13 and will conclude on September 10. To participate in the seasonal activities, players will need at least a yellow wristband. The event is structured into four weekly seasons, each offering seasonal challenges, events, and online competitions. Completing these tasks earns players points, which can be redeemed for exclusive prizes, including unique cars.

During the "Horizon Mascot Party" series, players can earn the 1970 Honda N600 by accumulating 80 points and the 1967 Renault 8 Gordini by reaching 160 points. The first week of the event, specifically the summer playlist, offers the 2018 Exomotive Exocet Sport V8 XP-5 for 20 points and the 1969 Datsun 2000 Roadster for 40 points.

Weekly challenges in the "Horizon Mascot Party" playlist consist of a four-step mission tied to a specific car, a photo challenge, and a treasure hunt. Successfully completing all four steps of a weekly challenge rewards players with 25,000 credits and 5 points. The current summer playlist's weekly challenge requires players to own and drive the 2017 Toyota JPN Taxi, perform three "Feed Me Skills" by smashing vending machines with it, park at any Car Meet in the taxi, and take a photo of the taxi at Tokyo Central Railway Station.

The summer playlist also includes a photo challenge, #SunnySnap, where players must photograph a 2013 Wuling Sunshine S at the Hokuryu Sunflower Farm to earn "Yellow Sports Sunglasses." A treasure hunt in the Shimanoyama Region offers 100,000 credits and 3 points. Daily seasonal challenges begin each day, offering limited-time opportunities to earn rewards. These include completing a Horizon Stunt Party round, beating a rival's ghost, earning three Air Skills, completing three laps of a Time Attack circuit, earning at least one star from Speed Traps, parking at a Car Meet, and completing a Road Race. Each daily challenge typically awards 5,000 credits and 1 point.

Seasonal events require players to use cars that meet specific restrictions to earn rewards. These include the "Small but Mighty" seasonal championship for road racing featuring the Honda S800, and "Dango Dashes" featuring the BMW Isetta. Other seasonal events include Time Attack races, Danger Sign challenges, Speed Zone events, and Drift Zone challenges, many offering wheelspins as rewards. A "Tokyo City Food Delivery" seasonal job also provides a Toyota JPN Taxi reward.

Online seasonal challenges involve competing against other players. "The Trial" requires teamwork against highly skilled AI opponents for a chance to win the Corvette '53 and 10 points. Participating in any Horizon Stunt Party rewards players with a mascot car horn and 3 points.

Additionally, the "Edamame Circuit" monthly rivals event challenges players to post a clean lap for a super wheelspin reward and 4 points. All challenges and rewards are part of the "Horizon Mascot Party" Series 4 event within Forza Horizon 6.