A record number of people are expected to be saying "up high" in Hamilton on Friday, taking part in UNICEF Canada's #HighFiveIt campaign.

The record for simultaneous high-fives is set to be broken during halftime of the Canada-England pre-World Cup friendly match at Tim Hortons Field. The current Guinness World Record is 4,699 people (or 2,349 high-fives, for those playing the home game), but UNICEF Canada expects more than that for Friday's matchup.

UNICEF Canada and Soccer Canada expect the game to be sold out Friday, with over 23,000 people in the stands. They're asking everyone to stay in their seats during halftime for a few extra minutes to slap hands with the person seated next to them.

But keeping track of the world's largest high-five won't be easy, said Sharon Avery, chief development officer of UNICEF Canada.

For the record to officially count, hundreds of spotters are coming in from all over the region to officiate the high-fives, she said. There will be one spotter for every 100 participants. Once the countdown has ended and everyone has slapped hands, the spotters have to confirm the group they were watching all high-fived at the same time.

Those documents are passed on to an auditor who confirms the official number before handing it off to Guinness.

The current record holder is Kroger Co., the U.S. grocery chain. Its employees set the record at a company meeting in 2013. Even if a quarter of those in attendance on Friday high-five each other, the record should be broken.

But it's not just about the official record, said Avery. The spectacle is part of a campaign engaging Canadians across the country to help stop preventable child deaths.

Avery's hope is the event goes viral, and even those who can't attend the game will still participate in raising awareness by posting pictures and videos of high-fives to social media with the hashtag #HighFiveIt.

And breaking the record will help spread the message, said Avery, who expects to crush the former record.

No word yet on the follow up, "down low."