Obtaining US sponsor [closed]

I have arranged an event in the US in New York for Aug 2021 and two of the speakers are from London (British) and two from India.

I understand that one needs a B1 visa for this charity event on world peace and none of the speakers are paid other than flights and accommodation.
My problem is that I am based in London and arranging the event and yet I need a US sponsor (institution) to act as the body applying for the B1 visa. I have tried to convince US universities to be the sponsor but no success.

Could a US citizen be our sponsor?

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How can an immigrant sponsor be stopped?

To withdraw the sponsorship, the sponsor must send a letter to the USCIS office, where the application is being processed, informing the office of the decision to withdraw. They must be sure to include a copy of their receipt notice when sending the letter. This helps in tracing their file quickly.

What disqualifies you from sponsoring an immigrant?

These include: an offense (unless committed by a parent or guardian) involving kidnapping. an offense (unless committed by a parent or guardian) involving false imprisonment. solicitation to engage in sexual conduct.

Can you get a US visa without a sponsor?

An individual who has a good financial background and who meets the other requirements for visa grant, can get visitor visa without a sponsorship. Remember that having a sponsor does not guarantee that the visa will be granted. Individual applicants must fulfill and qualify for the US visa.

How long is a sponsor responsible for an immigrant in US?

The sponsor's responsibility lasts until the immigrant becomes a U.S. citizen, has earned 40 work quarters credited toward Social Security (a work quarter is about three months, so this means about ten years of work), dies, or permanently leaves the United States.

Requirements to Sponsor an Immigrant in the US

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