Ah, great! I was looking for something like that in the manual, but tried to understand the basics first. Now it works perfectly!

I will try to solve my last issue myself, but in case you already know the solution: I want to display an extra </tr><tr> if the number of people repeated (with tal:repeat) is 4. Any suggestions?

Edit: I followed your example, but had to replace metal:fill-slot="content" with metal:define-slot="content" in template.html.