Originally Posted by: ManteoMax 
#Forzathon ChallengesForzathon challenges are timed opportunities to earn credits or XP or to unlock cars and features in the game. You can see upcoming Forzathon Challenges by clicking the Rewards menu in the top bar of this website, click the FH3 circle, and look at Locked Achievements:
Effective dates for these challenges can be seen from the Xbox dashboard in the Achievements sidebar:
THE CAPTAINTake part in an Online Adventure with a car that was originally D class to win the Steam Boat Horn.
Dates: 10/6/2016 to 10/9/2016
A BAD JOKEWin a game of Flag Rush in a car that was originally D class to win the Comedy Whistle Horn.
Dates: 10/6/2016 to 10/9/2016
ALL ABOARD!Complete 5 games of Flag Rush in a car that was originally D class to win the Train Horn.
Dates: 10/6/2016 to 10/9/2016
Cars that start in D class:
1980 Abarth Fiat 131
1968 Abarth 595 esseesse
1965 Alfa Romeo Giulia Sprint GTA Stradale
1973 BMW 2002 Turbo
1957 BMW Isetta 300 Export
1979 Chevrolet Camaro Z28
1957 Chevrolet Bel Air
1953 Chevrolet Corvette (C0)
1970 Datsun 510
1969 Datsun 2000 Roadster
1980 FIAT 124 Sport Spider
1975 FIAT X1/9
1969 FIAT Dino 2.4 Coupe
1952 FIAT 8V Supersonic
2011 Ford Transit SuperSportVan
1981 Ford Fiesta XR2
1978 Ford Mustang II King Cobra
1977 Ford Escort RS1800
1975 Ford Bronco
1973 Ford Escort RS1600
1973 Ford Capri RS3100
1966 Ford Lotus Cortina
1956 Ford F-100
1946 Ford Super Deluxe Station Wagon
1940 Ford De Luxe Coupe
1983 GMC Vandura G-1500
1977 Holden Torana A9X
1951 Holden 50-2106 FX Ute
1969 Jaguar Mk II 3.8
1954 Jaguar XK120 SE
1976 Jeep CJ5 Renegade
1991 Jeep Grand Wagoneer
1945 Jeep Willys MB
1968 Lancia Fulvia Coupe Rallye 1.6 HF
1953 Maserati A6GCS/53 PininFarina Berlinetta
1994 Mazda MX-5 Miata
1972 Mazda Cosmo 110S Series II
1967 Mercedes-Benz 280 SL
1949 Mercury Coupe
1971 Meyers Manx
1965 MINI Cooper S
1971 Nissan Skyline 2000GT-R
1969 Nissan Fairlady Z 432
1966 Nissan Silvia
1979 Opel Kadett C GT/E
1968 Opel GT
1977 Pontiac Firebird Trans Am
1972 Reliant Supervan III
1980 Subaru BRAT GL
1979 Toyota FJ40
1974 Toyota Celica GT
1974 Toyota Corolla SR5
1967 Volvo 123GT