A website, www.welovelondonbridge.com has been set up by a local business, which does not want to be named, to advertise the day.
The website has urged visitors and operators to donate to the UK Solidarity Fund, a charity where all proceeds help victims of terror attacks across the nation.
Throughout the day, there will also be team members from the British Red Cross walking around with donation buckets.
At least 16 pubs and many more bars and restaurants surround the area where three knife-wielding terrorists unleashed a horrific attack in the capital earlier this month (3 June), and these venues will be taking part in the day of support.
The Association of Licensed Multiple Retailers (ALMR) chief executive Kate Nicholls lauded the event and urged customers and operators to join forces in support for those in the area.
She said: “Saturday (1 July) will be a great opportunity for those working in the sector, and the wider general public, to get together and support the community.
“It will also be a chance to say thank you to the first responders who continue to perform admirably, despite the threat of danger in uncertain times."
On the front line
She added: “Eating and drinking out businesses were at the front line of the attack and many businesses have suffered on numerous levels.
“Team members put themselves in harm’s way to help members of the public and this is a great chance to show some support and appreciation for their efforts.
“If you are unable to make it to London Bridge this Saturday then please give generously to help support those individuals who have gone above and beyond.”
Nicholls launched a crowdfunding page to raise £2,000 to buy a round of drinks for the first responders in the London attack, which is now at more than £5,000.