Please answer the following question: Given the following passage  "Information had been kept on digital tape for five years, with Kahle occasionally allowing researchers and scientists to tap into the clunky database. When the archive reached its fifth anniversary, it was unveiled and opened to the public in a ceremony at the University of California, Berkeley.",  answer the following question. Note that the answer is present within the text.  Question: How did the public learn of the information?
Answer:
a ceremony