Microsoft plans to release Windows 10 as a free upgrade and with new PCs and tablets starting July 29. To celebrate the launch, the company will host fan celebration parties in 13 cities around the world that will feature hands-on demonstrations, live entertainment and interaction with developers from the Windows team. A related global ad campaign will launch next week. The Windows 10 release is also part of Microsoft’s year-long Upgrade Your World initiative “to celebrate those who inspire and empower others.”

Microsoft is partnering with 10 global and 100 local nonprofits for the new initiative, which will include a $10 million cash investment to support their missions.

Nonprofits participating in #UpgradeYourWorld include CARE, Code.org, Keep a Child Alive, Malala Fund, Pencils of Promise, Save the Children, Special Olympics, The Global Poverty Project, and The Nature Conservancy.

“Windows 10 is the best Windows ever and was built to empower people to do great things,” notes the Windows Blog. “It has new innovations like Cortana, Microsoft Edge and the Xbox app. It’s fast, more secure and compatible. It’s familiar and easy to use.”

Microsoft has teamed with retailers to promote Windows 10, help make upgrades seamless and educate consumers. Workshops and pop-up demos at Microsoft stores will also include prizes and giveaways.

Microsoft’s launch parties are scheduled to take place in Beijing, Berlin, Dubai, Johannesburg, London, Madrid, Nairobi, New Delhi, New York City, São Paulo, Singapore, Sydney and Tokyo.