Juneteenth is approaching, and Stockton residents planning to mail packages or take care of banking errands may want to plan ahead. Most national banks and all U.S. Postal Service locations will close on Friday, June 19, in observance of the federal holiday. This year’s Stockton Juneteenth celebration marks its 50th anniversary and returns Saturday, June 20, at the San Joaquin County Fairgrounds, 1658 S. Airport Way.