More than three months after an election that might have been tainted by fraud — and more than six weeks after the new Congress convened without a representative from North Carolina’s Ninth Congressional District — state regulators are scheduled to meet on Monday to consider evidence of possible misconduct.

The hearing, which could prompt the State Board of Elections to order a new vote in the district, may last until Wednesday and could include dozens of witnesses. Congress, which has the constitutional authority to determine its membership, will be watching closely.

Here’s a guide to where things stand ahead of Monday’s hearing.

There’s still an undecided election from the midterms?

The midterms — at least in the Ninth District, which includes part of Charlotte and a vast, rural swath of southeastern North Carolina — have not ended, and a House seat that Republicans have held since 1963 is still at stake.

At first, it seemed that the Republicans’ grip on the seat would continue: Mark Harris, the Republican nominee, took a 905-vote lead over his Democratic rival, Dan McCready. But state officials refused to certify Mr. Harris as the victor because of concerns about election fraud and, in particular, the conduct of L. McCrae Dowless Jr., a contractor for the Harris campaign.