Events at the skywatch happen every 30 minutes, with i think rare or uncommon chance. Events also happen in the forgotten shores too. Also that map doesn't tell you which events might happen (defend warsat, extraction crews, etc) :p
My apologies, this thread does though: http://www.reddit.com/r/DestinyTheGame/comments/2gltxy/how_i_maxed_out_my_vanguard_marks_in_under_4/
Yeah and in the comments below there is an improved map that includes the forgotten shore. - http://i.imgur.com/V7uXKGq.jpg
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