How can I promote the event? Easy :

Banner 540 x 180 px

Print version, as TIFF or PDF format.

Banner 750 x 190 px

Banner 150 x 200 px

Emblema Geoquest 2012 :

200x200 with transparency
200x200 white background
96x96 for avatars
Right-click, Save as...

From a smartphone :

Right-click, Save as...