Taken from the official site.....
Circuit open to the public:Saturday, 17:30 until 18:30 h Touristenfahrten, 10.10.2009 (Nordschleife)
Sunday, 08:00 until 18:30 h Touristenfahrten (Nordschleife)
Monday, 17:15 until 18:30 h Touristenfahrten (Nordschleife)
Monday, 17:15 until 19:00 h Touristenfahrten, 12.10.2009 (Grand-Prix-Circuit)
No mention about monday morning / daytime on there so circuit possibly closed?
Racing:Friday, 08:00 until 18:00 h RGB/ADAC-Rundstreckenrennen (Grand-Prix-Circuit)
Saturday, 08:00 until 18:00 h RGB/ADAC-Rundstreckenrennen (Grand-Prix-Circuit)
Saturday, 08:00 until 17:00 h BMW DE Challenge 7 GLP 7 (Nordschleife)
Sunday, 08:00 until 18:00 h RGB/ADAC-Rundstreckenrennen (Grand-Prix-Circuit)
Racing:

They have the F1 circuit shown for monday evening open to the public...
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EDIT: just found out that Mike Wright (pascal77uk on CGTI) is racing there on the sat:
Quote:
Hi Mike, i will be out there.
Upcoming Ring events
RCN 7th Race
Description: RCN 7th Race
Date: Saturday, 10 October, 2009
Time: 12:30-16:30
Duration: 240 minutes
Have met and watched him racing at Pembrey, he is also spending many of his hrs making some custom bits for my mk1, a top bloke

.
He is driving a LHD car at the Ring (trying to get info on it to keep an eye out).
This is his UK race car:
http://i86.photobucket.com/albums/k111/pascal77uk/digital016-1.jpghttp://img.photobucket.com/albums/v90/fthaimike/Pembrey%2011-05-2008/DCP_6632s.jpg