Stevie Wonder rocks out at Dreamforce in San Francisco

SAN FRANCISCO (KGO) -- If you happen to go past the Moscone Center you will run into one of the largest gatherings San Francisco has ever seen.

More than 170,000 people are attending this year's Dreamforce convention put on by Salesforce.

Like in previous years, there was a lot of star power at Dreamforce, including singer songwriter Stevie Wonder.

He played a great song followed by a powerful message of support for yet a new cause taken on by Marc Benioff and Salesforce. "What can we do as an organization to improve the world of those survivors, to create more survivors," he said.

Salesforce announced it will now partner with the University of California to improve the survival rate of breast cancer patients.

Benioff used this gathering to promote new and old causes such as a $1 million book drive which he kicked off from a temporary school house located in the middle of the convention. "The goal is going to be to fill every elementary classroom in San Francisco," San Francisco Unified School District Superintendent Richard Carranza said.

"We've got to create the talent for these companies for future generations," San Francisco Mayor Ed Lee said.

Among those participating in this mega convention was Uber CEO Travis Kalanick who hinted the rideshare company may someday turn to robots to deliver service. "When that technology comes out, what are the new things that we do and there will be new things," he said.

Benioff did not question Kalanick on legal disputes over the rights of employees versus contractors, but challenged him and others to give back to their communities.

Benioff is among the richest men in the tech sector 48 on the Forbes list.

The convention will end on Friday with an environmental message.