You can read the Clan Spotlight featuring Brazilian clan [CABRA] on the Portuguese Clan forums here: http://forum.worldoftanks.com/index.php?/topic/460813-cla-em-destaque-cabra/
CABRA and _WGA employees will be in Medium Stronghold Skirmishes on September 10 from 16:00 PT (19:00 ET) to approx. 18:00 PT (21:00 ET). You can earn 500 gold for a win, 250 gold for a loss, and 0 gold for a draw. Double it if you're streaming if you send a link to your stream to DavidBowieRocks by 09:00 PT (12:00 ET) the following Friday morning.