Thousands of motorcycle enthusiasts will descend on Grain Valley this week for the National Bikers Roundup, a motorcycle rally that runs Wednesday through Sunday at Valley Speedway and adjacent Thunder Valley.

The five-day event has, in years past, attracted about 20,000 members of more than 1,000 motorcycle clubs from around the United States, and Roundup spokesperson Rozell Nunn said he anticipates about that number again this year. Last week the grounds were covered with floodwaters after severe rain storms Wednesday night quickly inundated Sni-A-Bar Creek, but they quickly receded.

“From what I've seen, it's pretty dry,” Nunn said. “As long as it doesn't rain on us, we'll be OK. If it does rain, we'll be OK. Many times that just settles the dust.”

The National Bikers Roundup is the largest camping motorcycle rally in the country, according to its website, and is organized by several black motorcycle clubs. Black women make up nearly half of the participants. It first took place in 1977 in Kansas City, Kansas, and Grain Valley previously hosted in 1997. The rally has been in other locations in the metro area, including the former drag racing area near Raytown that is now Little Blue Trace Park.

The Roundup includes concerts, games, DJ tents, parades, stunt shows and drag racing. Cost to attend is $30 for the entire week, with an armband allowing for admission over multiple days. Event organizers will be collecting monetary donations and non-perishable food items to be donated to the Grain Valley Assistance Council and Harvesters.

With the heavy traffic anticipated, Old U.S. 40 east of Buckner-Tarsney Road to Monkey Mountain will be closed to through traffic, with the exception of emergency vehicles. In addition, on-street parking will not be permitted on Harris Street east of Main Street (Buckner-Tarsney).

Officers from the Missouri State Highway Patrol, Jackson County Sheriff's Department and Oak Grove Police will be assisting Grain Valley Police with traffic control during the week.