Not much ever happened on Gamorr. Occasionally outsiders would show up looking for violent fighters with low intelligence, but otherwise people tended to avoid it. This is likely due to the fact that nobody was sure how to pronounce it. Was it GAM-or? gam-ORR? Lando pronounced it Gamer, but he was not a reliable source for pronunciation.
Several Gamorrean Guards were from Gamorr. As would be expected.