@Josh: Any time :-)
Is it true, or does it makes sense to have my H1 tag display (also) my main keywords?
Google does weight heading text far more than plain body (paragraph) text but, since your site's title includes the word "Culture", I think you've got that covered. What you do not want to do seed your pages with keywords in such a way that you reduce the readability of the page for your human visitors. Google is pretty clever in this regard and, given that its overall intent is to try and prioritise/categorise page content in the same way that a human reader would, whatever you do to make your pages easier to understand & navigate usually pays dividends in Google too.
And/or does it hurt to have 2 H1 tags on the same post/page?
There are mixed opinions on this. I tend to the "It doesn't matter as long as you don't really overdo it" camp. 2 H1 tags should be fine. 20 is another matter entirely. :-)