And, in preperation for the 2012 event, we have THIS from English Heritage.org. From the "Conditions of Entry" page of that site:
Please remember that you will not be allowed access to the Monument with the following items: - Large quantities of alcohol - Drugs - Large bags or rucksacks (or similar items) - Sleeping bags or duvets - Flaming torches, Chinese lanterns or candles - Dogs (with the exception of registered assistance dogs), pets or other creatures - Camping equipment, including foldaway chairs, garden furniture - BBQs or gas cylinders - Glass/bottles or other glass objects - Trolleys, wheel barrows or any other form of porterage - Pushchairs or buggies that are not exclusively used for a childAnd, just to be sure you understand about the alcohol and drugs:
Only small amounts of alcohol for personal use will be permitted on to site. Alcohol is limited to no more than the equivalent of four 500ml cans of beer/cider or 75cl of wine. No further alcohol will be permitted on subsequent re-entry. Be warned, drug/alcohol cocktails can be lethal, so please be fully of aware of what you are doing. Illegal drugs are still illegal at Stonehenge as they are anywhere else. The police will be on site during the access period and will take immediate action against anyone breaking the law. Summer Solstice is not a good time to experiment with drugs - the crowd, the noise and the sheer size of the place are likely to make any bad reaction much, much worse. As much of the access is at night, if you had a bad reaction it may be difficult to locate you to administer treatment.But, startlingly I see that absolutely no amplified music is allowed.
Stonehenge is a world renowned historic Monument and it is seen by many who attend as a sacred site. Amplified Music is inappropriate and will not be permitted.So, that appears to rule out:
Shame really, because Nigel Tufnel knows the real story behind Stonehenge, and it doesn't involve aliens.