Omaha has two, possibly three. But it would be tremendous amount of work to clear a 7-10 days.
CHI which could hold 17,000 plus. Could have the practice arena held in the convention center. However.. Creighton men's basketball home court, SuperNova's home court, Nebraska High School State Wrestling Tournament.
Baxter Arena, has a practice ice in the same building, beautiful facility. Seats about 7,000-9,000. However it is the home hockey arena of the UNO Maverick hockey team
Liberty Arena smaller. Home court for Omaha Lancers Hockey team, Omaha Beef Indoor Football and Omaha Lov3 Volleyball Team
All have games or tournaments in Jan. Besides Nats have been in Wichita and St Louis.
But
@Karen-W is right, for arenas especially large ones, are hard to schedule.
Of course when Nats was in Omaha, not great attendance, Worlds was in Canada, USFA didn't help much with advertising, Omaha didn't either. Not many direct flights, although more are being added