It promises to be the hottest party in the city; a huge square in Trafalgar Square to celebrate the end of the gender pay gap.
But there is only one outlet. The guests were asked to save the date – in 2235, the year in which the World Economic Forum declared that the gap will be closed, given the current rate of change.
Labor MP Stella Creasy said the party, which he organized and will be hosted by the mayor of London Sadiq Khan, carries a serious message.
"Shedding light on a problem does not necessarily do anything about it," he said. "The government does not have an explicit commitment to act on the causes of this gap and we want to change it – just talk about the pay gap – it's time to take action to end it."
Invitations were published while research conducted to celebrate Saturday's Equal Pay Day revealed that the new gender pay gap reporting rules had not eliminated workplace disparities. Equal Pay Day marks the day of the year when the average worker ceases to be paid because of the gender pay gap.
Creasy called on the government to reintroduce the explicit duty to act on wage inequalities in the public sector, which is only required to "respect" the need to promote equality.
Marking the day of equal pay, the Fawcett Society announced that it was launching a legal counseling service for low-income women to combat wage discrimination. The campaign is in collaboration with the YESS Law charity organization and supported by a donation from the former BBC correspondent Carrie Gracie.
He also revealed research that shows that free pay discussions are still rare, with six in ten (61%) of workers saying they are uncomfortable asking a colleague how much they earn, while 52% say their managers would respond negatively to greater transparency. One in three workers interviewed by the researchers did not know that it is illegal to pay women and men differently for the same job.
"Compensation discrimination is able to thrive and is more common than people realize because of a culture of pay secrecy that persists," said Fawcett CEO Sam Smethers. "People do not know their fundamental rights and they do not know what their colleagues earn".
The search for the Young Women's Trust to celebrate the day found that one in five women said they had been paid less than a male colleague for the same job or the like but less than half were sure they could challenge the employer work on gender pay gap. According to the charity, a tenth head of human resources in organizations with more than 250 employees is aware that women in their organization are paid less than men for jobs at the same level.
"Research by the Young Women's Trust shows that young women apprentices earn eight percent less than their male counterparts, leaving them more than £ 1,000 a year in worse conditions," he said. CEO of Trust, Dr. Carole Easton. "The sectors in which women tend to work – such as administration, health and social care and retailing – are not valued and paid as much as they should".
One of the factors that determine the gender pay gap in the UK is that women are more likely to occupy jobs and low-paid sectors, said Tess Lanning, director of the Living Wage Foundation.
According to data from the Office for National Statistics, 3.8 million, or 28%, of all the jobs of employees performed by women are paid under the real wage of life, compared to 18% for men . The clearest difference is in the East Midlands, where 34% of women are paid below the living wage compared to 20% of men.
"Millions of women are trapped in jobs that pay below a real living wage, especially in administrative, clean-up and care roles," Lanning said. "Plans to improve gender equality must involve more companies that are committed to paying a real living wage, not just the minimum of government".
On Friday the Women's Equality Party encouraged female workers to send out-of-office messages to celebrate Equal Pay Day.
"Women are rightly fed up with the lack of progress," said Catherine Mayer, president of the Women's Equality Party. "Requesting companies to publish data on their gender pay gap is a waste of time if they do not take action to close it".
There were however some glimmers of optimism. A small study by the law firm GQ Littler found that 39% of companies reviewed their recruitment procedures in an attempt to close the gender pay gap, while 26% had conducted pay audits and 21% had changed their policies remuneration. A survey by Totaljobs found that 46% of organizations that are taking measures to reduce the gender pay gap are actively promoting women in senior roles.
Earlier this month, the Office for National Statistics revealed that the gender pay gap fell by half a point from 18.4% to 17.9% and the full-time pay gap fell from 9 , 1% in 2017 to 8.6% in April 2018.