The "Howdy, Modi" event has been organised in Houston by expat Indians. Mr Trump will share stage with him in what is being seen as an acknowledgement of growing India-US ties.

The White House has said that President Trump will join PM Modi at the Houston rally as a "special gesture" to underscore the bond between the two countries.

The event will also feature US lawmakers, prominent Indian Americans and 400 artistes who will present a cultural show.

PM Modi began his marathon tour with a roundtable with the CEOs of energy companies today. He had a "fruitful" meeting with top energy sector CEOs with discussions focussing on energy security and expanding mutual investment opportunities between India and the US, Foreign Ministry spokesperson Raveesh Kumar said. On Sunday, he will attend the grand event, where Mr Trump is also expected to address Indian expats.

On Tuesday, PM Modi and Mr Trump will hold a bilateral meeting in which they are likely to discuss the trade standoff over tariffs between the two countries. The White House has confirmed that President Trump will discuss ways to deepen the trade relationship between the two nations.

On Wednesday, PM Narendra Modi will attend an investment roundtable with 40 major companies. The meeting is crucial for India, which is trying to spur growth after its Gross Domestic Product growth dropped to a five-year low.

Before concluding his visit on Thursday, PM Modi will address the UN General Assembly.

PM Modi's speech will draw eyeballs amid tension between India and Pakistan over the scrapping of special status to Jammu and Kashmir. Pakistan Prime Minister Imran Khan, who will address the UNGA session shortly after PM Modi's address, has said that he will raise Kashmir at the top world body meet.

India has reiterated its stand that the move in Jammu and Kashmir -- ending its special status and bifurcating it -- is an internal matter. "Article 370 is an internal issue. Terrorism is one among many issues. The focus will be on India's role at global stage, the Prime Minister will present his vision in this regard," Foreign Secretary Vijay Gokhale said last week.