D1: Public Events

Check out DestinyPublicEvents.com for a reasonably accurate source on Public Event timings.  The website engine uses an auto-learning algorithm to adjust times based on 'thumbs-up' feedback by Destiny gamers.  The algorithm will calculate trends, even if Bungie changes their Public Events schedule.

As of this writing, Public Events occur on Earth, Earth's Moon, Mars and Venus, as follows.

Earth — Old Russia (11 events / hour)
Moon — Ocean of Storms (5 events / hour)
Mars — Meridian Bay (8 events / hour)
Venus — Ishtar Sink (6 events / hour)