I am in 4 tournaments that are no vacation where I am waiting for the second round to start. I am going on vacation. Can I withdraw from the tournaments now, before the second round starts, without losing games (and rating?)?
Yes. You can't lose games that have not yet started.
I am in 4 tournaments that are no vacation where I am waiting for the second round to start. I am going on vacation. Can I withdraw from the tournaments now, before the second round starts, without losing games (and rating?)?