Contest and Events Calendar
http://jsfc.org/apsprint/aprule.txt
http://www.wwsatest.org
http://www.drcg.de
0000 – 0759 UTC Saturday.
1600 – 2359 UTC Saturday.
0800 – 1559 UTC Sunday.
http://www.jarl.org/English/4_Library/A-4-3_Contests/
http://www.arrl.org/field-day