Can I be barred for not attending a promotion board or having my packet pulled from the promotion board?

SUBJECT: Army Directive 2017-28 (Sergeant and Staff Sergeant Promotion
Recommended List):
2) Primary Zone. Appearance before a local promotion board is mandatory for
all Soldiers upon initially reaching primary zone eligibility. All Soldiers approved for
promotion list integration will be integrated into the promotion recommended list with all earned promotion points. A Soldier who is not recommended for integration will be
formally counseled on why he or she was not recommended. Counseling must identify what Soldiers must do to improve their knowledge, skills, and attributes and to prepare themselves for increased responsibility. The counseling also must address the consequences of not being integrated into the promotion recommended list. Those consequences include a potential bar to continued service (references 1 b [Army Regulation (AR) 140-111 (U.S. Army Reserve Reenlistment Program), 9 May 2007, Rapid Action Revision Issued 6 September 2011] and 1 e) [AR 601-280 (Army Retention Program), 1 April 2016] because the Soldier is noncompetitive for promotion and does not demonstrate
leadership potential. Additionally, retention control points (reference 1 a) used to determine the maximum years of service a Soldier may serve without promotion should be incorporated into the counseling. Soldiers who respond to training and counseling, and demonstrate they have the potential for increased responsibilities will be sent to the promotion board.

Technical yes- you have not shown any interest in promotion, so they can bar you til your RMP is reached- use to be 8 yrs max for a SPC.