Any upcoming competitions, from either ideas or official, are available in the Upcoming Competitions drop down menu above. Any that have been announced, are official and have all the relevant information have their own sub-menu in the drop down menus above.
The most recent past competitions can be found in the drop down menu above, and any further past competitions can be accessed by click on the Past Competitions drop down menu above also. On these competition pages you can find the general information and all of the world, continental and national records from the competition as well.
Read up about how to go about organising a competition on this page