The main agenda of PM Modi's Day 2 visit to the United States included several important meetings and engagements. Here are the key points:

• Meeting with Vice President Kamala Harris
• Participation in the Quad Leaders' Summit with the leaders of the US, Japan, and Australia
• Addressing the United Nations General Assembly (UNGA) session
• Meeting with CEOs of major US companies to discuss investment opportunities in India
• Attending a COVID-19 response and recovery roundtable
• Participation in the Global Citizen Live event to raise awareness about climate change and other issues

Overall, PM Modi's Day 2 visit was focused on strengthening India's partnerships with the US and other countries, promoting investment opportunities in India, and addressing global challenges such as the COVID-19 pandemic and climate change.