Jedan od najsvestranijih kalendara svetskih trka je:
U donjim linkovima mogu se naći najatraktivnije maratonske i ultramaratonske trke širom sveta:
ultramaratonske: http://statistik.d-u-v.org/calendar.php
maratonske: http://www.aims-association.org/Calendar.htm
Evo i nekoliko nacionalnih kalendara:
Poljska: http://www.maratonypolskie.pl/mp_index.php?dzial=3&action=1&grp=13&trgr=1&bieganie
Slovačka: http://beh.sk/ http://42195.sk/
Češka: http://www.behej.com/terminovka[/
Mađarska: http://www.futoversenynaptar.hu/
Hrvatska: http://www.trcanje.hr/utrke/najave/
Klub 100 maratona 
Thanks for the list of sites where to look for interesting races around the world. Quite good sites with interesting information about races.