If you haven't been already, get the harvesting tools and just gather everything as you see them. The little EXP adds up. As for events, well, some areas seem to have more frequent happenings than others, and at the barest level, I'd say they somehow relate to player activity in the area for some of them. If you really want to chase 'em down, you'll have to frequently check your map for the orange circles/skulls/whatever and WP closest to them.
Checking my achievements before logging, I've done 58 events, myself. There's probably 10 of those I've done 2-3 times in the process and I've only done the starting areas for Human and Norn so far. I'm like 5 levels over my current PS quest (16, with me 21), but I'll get downleveled to that, anyway. And I think the next one is level 20. But yeah, just keep at it.
If I had one major gameplay gripe it'd be the sheer advantage ranged attacking has. I've killed a lot of veteran type mobs or even kited bosses around by plinking them with my gun. While greatsword is my melee weapon of choice for my warrior, being in range is too often an easy dirt nap even if you do dodge attacks decently. And some mobs don't seem to telegraph stuff, so sometimes you're just instantly hit by ****, too. A few of the event bosses can be notorious for this, like the little ice dragon between the towers in the Norn north region when capturing those. With the general absence of tanks, this can get old fast.
Violence good. **** bad. Yay America.