The CQ World Wide DX contest for SSB is
held every October. The rules for this contest can be
found here. Everyone can participate and
the data exchanged for each QSO is simple: a signal
report and your CQ Zone. If you live in Boston you
would say "59 05" (signal report of "59" and zone
"5"). I gave the exchange "59 08" from St. Kitts.
I placed 6th in the US in this contest in 2006 in the QRP
ALL BAND category and had hoped to do much better from the
Caribbean.