A new Texas nonprofit led by Donald Trump’s grown sons is offering access to the freshly-minted president during inauguration weekend — all in exchange for million-dollar donations to unnamed “conservation” charities, according to interviews and documents reviewed by the Center for Public Integrity.

And the donors’ identities may never be known.

Prospective million-dollar donors to the “Opening Day 2017” event — slated for Jan. 21, the day after inauguration, at Washington, D.C.’s Walter E. Washington Convention Center — receive a “private reception and photo opportunity for 16 guests with President Donald J. Trump,” a “multi-day hunting and/or fishing excursion for 4 guests with Donald Trump, Jr. and/or Eric Trump, and team,” as well as tickets to other events and “autographed guitars by an Opening Day 2017 performer.”

Website TMZ.com first published a brochure hyping the happening. The brochure says that “all net proceeds from the Opening Day event will be donated to conservation charities,” but it does not name the charities or detail how net proceeds will be calculated.

Who’s behind the get-together?

Walter Kinzie, chief executive officer of Texas event management company Encore Live, confirmed to the Center for Public Integrity that a nonprofit group called the Opening Day Foundation hired his firm to manage Opening Day 2017.

A Center for Public Integrity review of Texas incorporation records found the Opening Day Foundation was created less than a week ago, on Dec. 14. Unlike political committees, such nonprofits aren’t required by law to reveal their donors, allowing sponsors to write seven-figure checks for access to the president while staying anonymous, if they choose.