it will be on in the restaurant above the car park at the start/finish. you can catch a glimpse while the motor is cooling. there's no need to watch the whole race anyway, just the start and finish.
don't forget that spa is just around the corner from nuerburg, so you could go and watch the quali on saturday if you're really into it. i reckon the track will be horrendously busy on saturday evening because of all the motor nuts in the area for the gp.
i would recomend karting at the museum at the new track as well on saturday. i would come and kick your arses, but other things to do