Up to 100 people will become millionaires on the night of the Olympics opening ceremony when a special National Lottery draw takes place.
The one-off draw aims to smash the world record for the most millionaires created in a single night.
Lottery operator Camelot said more than 20 million extra playslips ready to take players' lucky numbers have been despatched for the event, while more than eight million metres of ticket roll are ready to be transformed into tickets for the draw.
The National Lottery Line will be open until midnight on Friday ready to greet lucky ticketholders and will have four times the normal level of staff on standby to take players' calls.
Tickets have been available to buy in advance, with other EuroMillions draws, but now players can purchase a line just for the special EuroMillions Millionaire Raffle.