The EA PSK31 Contest takes place in the 10, 15, 20, 40 and 80 meter Amateur bands on the 2nd full weekend of March each year.
PSK31 is a great mode for those operating lower power (10 watts or less).
Any Amateur HF SSB rig can be used for PSK31 by simply hooking it up to the soundcard of a standard PC and running free PSK31 software that can be downloaded from the web.
The EA PSK31 contest manager Joaquin EA4ZB writes:
It's a pleasure for me to invite you to join the next EA PSK31 2009 which is to be held on 14 and 15th March.
Complete official rules here:
Hope to see you