BOSTON — A trial date has been set for the former chairman of the Mashpee Wampanoag Tribal Council and a Rhode Island architect facing bribery and extortion charges. Cedric Cromwell, 55, and David DeQuattro, 54, have a jury trial scheduled together starting at 9 a.m. Sept. 7 in front of Judge Douglas P. Woodlock in U.S. District Court in Boston, according to court records. Cromwell, of Attleboro, was charged in March with four counts of filing a false tax return on top of other charges of bribery and extortion from November. He and DeQuattro, the owner of a Providence-based architectural firm that was hired to work on a number of tribal projects, were each indicted by a federal grand jury in November on two counts of accepting or paying bribes as an agent of an Indian tribal government, and one count of conspiring to commit bribery. Cromwell was also indicted then on four counts of extortion under color of official right and one count of conspiring to commit extortion.