Given the task definition and input, reply with output. This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

In 2012, the AFL celebrated its silver anniversary for its 25th season of operations. The season kicked off on March 9, 2012. The Tulsa Talons moved to San Antonio, Texas and Jeffrey Vinik became owner of the Tampa Bay Storm. The Dallas Vigilantes were left off the schedule for the 2012 season with no announcement from the management, raising speculations that either the team had suspended operations for the season or was ceasing operations altogether. (Apparently the latter was the case as the organization did not field a team for the 2013 season or any subsequent one either.) Like the National Football League, the AFL postponed the free agency period to October 31 due to Hurricane Sandy.
What anniversary did the Arena Football League celebrate in 2012?