Submission deadline for the June release of the TOP500 List is April 28th (23:59 PST). All system reported have to be installed and submitted by April 19th. The last date for submitting Linpack updates is April 28th. (Systems must have been submitted by the deadline above).
The deadline for the submission of new sites for the November release of the TOP500 List is October 20th (23:59 PST). All system reported have to be installed by October 27th. The last date for submitting Linpack updates is also October 27th (Systems must have been submitted by the deadline above).
The interface for submitting new systems is http://top500.org/submit