No, here "get celebrated" is a passive form of the verb "to celebrate", not the adjective "celebrated". "I celebrated my birthday yesterday." "How did you celebrate it?" "I celebrated it WITH a party"= I celebrated it BY HOLDING a party ---> My birthday was celebrated with a party= my birthday got celebrated with a party. People celebrate Star Wars. How do the celebrate it? They celebrate it WITH a special holiday= they celebrate it by participating in a special holiday -->star wars is/gets celebrated with a special holiday.