What are you basing your statement on? It is bigger than AWS at least in 2019
""Sep. 13, 2019 Updated: Sep. 13, 2019 10:29 p.m. Oracle OpenWorld, a tech conference with some 60,000 attendees" https://www.sfchronicle.com/bayarea/article/San-Francisco-wa...
"...From December 2 to December 6, we expect more than 60,000 attendees will spread out across six venues on the Las Vegas Strip, promising to make re:Invent 2019 the biggest re:Invent yet..." AWS re:Invent 2019
"...Well, here we are: a little over a week after Salesforce’s 17th Dreamforce. As a lush green forest burgeoned in downtown San Francisco, over 171,000 people from 120+ countries around the globe came together to have the time of their lives with fellow Trailblazers, learn how to help their customers succeed, and promote equality, sustainability, and trust — in short, to transform their businesses and the world we share..." https://www.salesforce.com/blog/dreamforce-2019-infographic/