event.
Taking place on Friday 8 March, which is International Women’s Day , the event described as Barclays' and the FA's biggest ever football session, is expected to involve more than 4,000 schools.
According to the FA more than 465,000 girls are participating in the event which is supported by Barclays Girls Football Schools Partnership.
Williams, who is backing the campaign, said: "When I when I was coming through, I was playing out on an estate, not really knowing anything about women's football opportunities.
Read More Football Stories "There were very limited opportunities for me to participate or even be coached within a very organised set-up.
"If I’d had this kind of activity in my time, my journey probably would have been a little bit different to how it was.”
When asked what more could be done to encourage more girls to get involved in football, Williams spoke of the need for activities away from the pitch as well as on it.
The former Liverpool, Arsenal and Reading ace, who retired in 2019, added: “For me it’s not just about playing, but finding plenty of ways for females to get involved in the sport.
"There have to be opportunities out there for girls to get involved in football off the pitch.,
"There should even be opportunities for those aspiring to become groundswomen, as we’ve seen with Arsenal using a whole team of groundswomen for the first time on Sunday.
Williams, who presents the , was sharing her thoughts two days after doing punditry during the Gunners '1-0 defeat of Spurs in the Barclays WSL.
The result saw Arsenal, who are third, open a nine-point gap on fourth-placed Man United who dropped points ahead of their league duel with Bristol next weekend.
And Marc Skinner’s side who face Brighton in the Women’s FA Cup are currently level on points with Liverpool.
Williams added: “I think the top three spots will be claimed by Chelsea, Man City and Arsenal.
"For Man United, now it’s whether can they finish fourth.
"If they do anything less than that now, given the success they had last year in the league and the FA Cup, it’s a failure for them.
“Liverpool will push them and could potentially get that fourth spot come the end of the season.
“United haven’t performed this year as they performed so consistently last year.
Williams is backing Reds boss Matt Beard to push Man United all the way in the race to finish in the WSL's top four this term Credit: Getty “I do my podcast every week and I have Man United Women’s fans on at me questioning Marc Skinner.
"It’s difficult when you overachieve, which I think Man United did last year, and to try and do that again.
"I certainly don’t put that down to just Marc Skinner."