The Leader-Courier and Dakota Dunes/North Sioux City Times has announced early deadlines for upcoming holiday editions.The deadline for the Dec. 18 edition is Friday, Dec. 12, at noon. The deadline for the Dec. 25 edition is Thursday, Dec. 18 at noon, and the deadline for the Jan. 1 edition is Wednesday, Dec. 24 at 5 p.m.Community members and advertisers are encouraged to submit news items,…