The agency won the work following a three-way pitch. Lineup will build a national media relations campaign focused on building memberships, announcing music events and helping educate people about disability and inclusion.
WNP will be launched on 1 July, with rapper Tinie Tempah headlining. Other global acts that have confirmed their support include Coldplay, Ed Sheeran, Sam Smith, James Blake and Mark Ronson.
Lineup will work alongside WNP ambassadors such as basketball paralympian Ade Adepitan, TV presenter Alex Brooker, paralympian Martin Dougan and paralympian wheelchair racer Hannah Cockroft.
Jamil said: "I one day decided I simply can't continue living in a world that excludes such a large part of society. Some of my best friends are those people. I am so grateful that I am finally in a position where I can help to do something about it."
WNP co-founder and MD Divya Daryanani added: "On top of the great ambassadors and music artists that we’re working with, we wanted an agency that shared the same passion and understanding of what needs to be done. There is a huge audience being overlooked when it comes to live music and entertainment and it’s all about to change. Why Not People will be addressing all the current barriers that people with disabilities face while hosting music events built to enhance the experiences of members and their mates."
Lineup founder Ali Sheik said: "The support and feedback for Why Not People has been incredible. The impact that these events will have on WNP members and their friends and families will be life changing."