Found this in different threads, written by Danmeister (it's about 2011, but guess it's not too far from the facts this year):
"In 2009 Graspop Metal Meeting launched its now famous Boozebag concept: only available in presale, each bag consisted of a number of tokens that paid for both food and drink.
Three years later the Boozebag has become part and parcel of the Graspop experience.
A Boozebag still costs 50 euros and the 22 Graspop tokens inside will buy just about anything on sale in the festival arena, be it beer, soft drinks, French fries, pizza, etc.One Graspop token is worth 2.50€.
Just to give you an idea:
* one beer or one soft drink: 1 token
* Metal Market entrance fee: 1 token
* Festival programme: ½ token
* French fries with sauce: 1.5 tokens
* Breakfast package: 2.5 tokens
Graspop tokens are just 2.25 euros when bought in advance as opposed to 2.50 euros/token on the day, so you don’t need a calculator to tell you why you should order a Boozebag today.
Also, the content of the boozebag will be slightly different this year. Apart from the 22 Graspop tokens, you will also receive a stamp card that you can use to collect a wide selection of fun gadgets as well as a few free drinks from the sponsor stands dotted around the festival site.
The Boozebags are sold as vouchers with a unique barcode that must be scanned at the box office on the day. If the bar code is valid, the voucher is exchanged for the Graspop tokens and the stamp card, which will enable you to collect the gadgets from the various sponsor stands.
We’re extending Boozebag sales to give everyone ample opportunity to make use of this unique offer. Still, don’t wait too long because the offer is only valid until 16 May... "
"The official t shirts have been €20 since 2008 when I started going to Graspop"
"The charging points just have lots of different phone adapters, so there isn't a place to plug other things like cameras"
"There is no early entry. The campsite opens for everyone on the Thursday before the festival. It usually opens around 2pm. "
"About 75 bands attend Graspop each year."
"The festival is in Dessel Belgium
map. I normally drive over, and I get the ferry over to France.
Norfolkline is normally the cheapest, it does take a little longer than the ferries to Calais, but it goes to Dunkirk which is nearer Belgium. From the Isle of Wight it takes me about 12 hours to get there. "
TRAFFIC DISRUPTIONS ON THE E34 MOTORWAY Traffic may be slow between the motorway exit and the festival site if you’re travelling by car via the E34 motorway (Antwerp or Eindhoven). There’s a diversion as the centre of Retie is closed to all traffic.
Fans travelling from the direction of Eindhoven should take the number 26 exit (Arendonk/Retie) and then follow the signs for GMM.
Fans coming from the direction of Antwerp should take exit 25 (Oud-Turnhout/Mol/Retie).
SHUTTLE SERVICE BETWEEN MOL STATION AND THE FESTIVAL SITE The shuttle service organised by Flemish public transport operator De Lijn takes festivalgoers from Mol station to the festival grounds and back. The only pick-up/drop-off point for the shuttle buses is right across the main entrance to the campsite/festival arena. Guests staying in Graspop Metal Town should also get off here. GMT is a 15-minute walk from the bus stop.
All ticket holders can use these buses free of charge. It’s approximately 20 minutes from Mol station to the festival site.
NO NIGHT TRAINS No night trains will run after the festival. Special buses have been scheduled for those who’d like to catch the last train.
EXCHANGING BOOZEBAGS & FESTIVAL AT THE MAIN CAMPSITE/FESTIVAL ENTRANCE Guests must first collect their wristbands at the main campsite/festival entrance to have access to the campsite or festival grounds. This also goes for boozebag vouchers.
Box office opening hours: Thursday: 2pm-7am
Friday: 7am-2pm
Saturday: 7am-1am
Sunday: 07am-1am
ATTENTION: DAY TICKET holders only have access to the festival arena and the campsite on the day printed on their ticket.
HAVEN’T GOT YOUR FESTIVAL TICKET YET? Don’t panic! While stocks last, day tickets are still available at the festival and campsite box offices.
Combi tickets: 156€
Day tickets: 86€ (remark: during the festival, you can only buy day tickets for that particular day)
CAMPSITE The campsite opens at 2pm on Thursday 23rd June and closes at noon on Monday 26th June. On Thursday, the campsite is only accessible for COMBI ticket holders. DAY ticket holders only have access to the campsite on the day printed on their ticket. They must first buy a camping wristband (15€) at the campsite entrance. This wristband is valid from 8am on the day until noon the following day.
Campsite access is free for COMBI ticket holders.
METAL PLAZA OPEN ROUND THE CLOCK (OR JUST ABOUT) The Metal Plaza is the zone wedged in between the campsite and the actual festival arena. This zone is sealed off between 5 and 7am each morning to make the necessary preparations for the next festival day.
The festival starts on Friday 24 June but the Metal Plaza opens its doors at 4pm on Thursday 23 June for the Red Bull Bedroom Jam and the Video Top 100.
GMM TOKENS PAY FOR FOOD AND DRINK To make everyone’s stay as easy and practical as possible, GMM tokens are the only accepted currency. These tokens buy cold beers, soft drinks, French fries, pizza, etc.! in the arena, a GMM token costs 2.50 euros. You can buy GMM tokens from the token stands and the token dispensers both in the Metal Plaza and the festival arena. Both cash and cash cards are accepted.
POLICE POST & FIRST AID POST Theft, material damage, loss of property and so on must be reported to the police post.There’s a Red Cross first aid post both in the festival arena and the Metal Plaza for injuries small and not so small…
INFO SCREENS, INFO DESK & BOOKLET Scattered across the festival grounds are a number of screens advertising all practical details regarding the lineup, signing sessions, updates, etc.
The people at the info desk in the Metal Plaza will be more than happy to answer all your practical questions.
Apart from the festival lineup, the GMM booklet also contains a host of info on the festival, the campsite, signing sessions, the bands and much more. This booklet is available from the merchandise stand for half a GMM token.
POTABLE WATER The weather gods have promised us another scorching weekend for this 16th edition so remember to keep hydrated! Potable water is available from the washbasins in the Metal Plaza and festival arena as well as on the campsite.
BEWARE OF PICKPOCKETS More and more festivals are being targeted by pickpockets. Protect your valuables and do not put your wallet in your back pocket.
PROTECT YOUR EARS Graspop Metal Meeting respects the applicable noise level standards. Thanks to the use of high-end equipment, the sound quality is first-rate and the decibels are kept to an acceptable level. Still, ear protection is always a good idea. Free ear plugs can be collected from the info desk and the Proximus stand. "