Newark Days is a four-day festival held to commemorate the birthday of the City of Newark, California, held every year in September. The 2026 Newark Days Celebration will be from September 17-20 with the theme, Adventure is Just a Page Away! 

Newark Days is enjoyed by over 100,000 people every year. The festival is organized by Newark Days Celebration Inc., a 501(c)(3) nonprofit organization that is made up entirely of volunteers. The volunteers of the Newark Days Committee work throughout the year to plan and host all the events.