This year, the OSgrid will turn 8 years old. A bronze anniversary. The OSG8B regions have been booted, which means OSG residents can fire up the creative engines, and and start working on a nice display for their cause /venue / region. The festivities are planned for 25th and 26th of July 2015. To obtain a plot for your display, and inform how you can participate in making this the best birthday party yet, you can contact any of the OSG admins inworld.
For the various inworld activities the event calendar will likely appear in the OSG forums. I suspect the annual "Celebration party", with long speeches about the good, the bad, and the ugly, and various DJ's & performances of the OSG residents, which typically makes for a great event. More news on it later, hopefully with a sneak preview of a build at the displays.
Meanwhile, if your a Gamer, you are in sale heaven this week. Steam, Humblebundle, Indiegala, bundlestars, G2A, they all have awesome discounts and offers, which include some very nice titles, for very few $.