This excerpt taken from the GOOG DEF 14A filed Mar 25, 2008.
A: You are entitled to attend the Annual Meeting only if you were a Google stockholder as of the Record Date or you hold a valid proxy for the Annual Meeting. Since seating is limited, admission to the meeting will be on a first-come, first-served basis. You should be prepared to present photo identification for admittance. If you are not a stockholder of record but hold shares as a beneficial owner through a broker, bank, trustee or nominee (i.e., in street name), you should provide proof of beneficial ownership as of the Record Date, such as your most recent account statement prior to March 11, 2008, a copy of the voting instruction card provided by your broker, bank, trustee or nominee, or other similar evidence of ownership.
If you do not provide photo identification or comply with the other procedures outlined above, you will not be admitted to the Annual Meeting. For security reasons, you and your bags will be subject to search prior to your admittance to the meeting.
Please let us know if you plan to attend the meeting by marking the appropriate box on the enclosed proxy card, if you requested to receive printed proxy materials, or, if you vote by telephone or Internet, by indicating your plans when prompted.
The meeting will begin promptly at 2:00 p.m., local time. Check-in will begin at 12:30 p.m., local time, and you should allow ample time for the check-in procedures.