Cal Anderson MayDay USA rally — OIG Sentinel Event Review identifies 66 contributing factors, 24 recommendations; SPD lieutenant on body cam: 'going in with guns blazing... here to fuck people up'

On May 24, 2025, the Seattle Police Department’s response to a counterdemonstration against a MayDay USA rally at Cal Anderson Park resulted in 23 arrests, 16 reported uses of force, seven Office of Police Accountability investigations, and a body-camera recording of Lieutenant Matthew Didier telling his team they were “going in with guns blazing” and “here to fuck people up now.” The Office of Inspector General for Public Safety published a Sentinel Event Review on February 12, 2026 identifying 66 contributing factors and 24 recommendations across four categories before the panel was discontinued due to a confidentiality breach. The Event was the first major test of Seattle’s local-only police oversight system after the September 2025 lifting of the 13-year federal consent decree.

What happened

On April 8, 2025, Seattle Parks and Recreation approved a permit for MayDay USA, a Christian fundamentalist group, to hold a rally labeled “#DontMesswithOurKids” in Cal Anderson Park on May 24, 2025. Cal Anderson Park is named for Washington’s first openly gay legislator and is the cultural center of Seattle’s historic LGBTQ neighborhood. Parks did not notify SPD of the permit until May 14, leaving 10 days for crowd-management planning.

Hundreds attended the rally and hundreds of counterdemonstrators gathered to protest. The Event spanned seven hours and resulted in 23 arrests of counterdemonstrators (for property destruction, assault, and obstruction; most charges were eventually dropped) and 16 reported uses of force by SPD. Crowd-control tools deployed included bicycle fencing, batons, oleoresin capsicum spray, and PepperBall launchers.

Immediately before a wave of arrests, body camera footage captured Lieutenant Matthew Didier, leader of an SPD Community Response Group unit, telling his team they were “going in with guns blazing” and “here to fuck people up now.”

On June 7, 2025, the Office of Inspector General for Public Safety committed to conducting a Sentinel Event Review of SPD’s planning and response. OIG, in collaboration with the Community Police Commission, identified panelists from impacted communities, LGBTQ organizations, SPD, and community members. The panel held three lengthy sessions.

After three sessions, one panelist publicly disclosed confidential details from panel discussions. OIG terminated the review process. The published report is a summary of panel discussions reviewed by many panelists, explicitly not a consensus product.

What the primary source says

The OIG Sentinel Event Review Report Summary, released May 12, 2026 as a follow-up to the February 12 main report, states that panelists identified 66 contributing factors and 24 recommendations across four categories (Community Legitimacy, Situational Awareness, Communication, Tactics) before the process ended.

Contributing factors identified include, in the OIG’s own language:

• City Procedures. “Coordination between SPD, Seattle Parks and Recreation, the Mayor’s Office, and the City Attorney’s Office limited SPD advance knowledge of the permitted rally and hindered SPD planning efforts.”
• Cultural Context. “The lack of acknowledgement or understanding of this context by SPD contributed to heightened tensions.” The Capitol Hill neighborhood’s historical significance to LGBTQ+ communities was unrecognized in SPD planning.
• Anticipatory Defensiveness. “Outdated assumptions by SPD that ‘antifa’ and ‘black bloc’ are violent groups with intent to confront police, led SPD to misjudge the need for crowd control tactics, including uses of force.”
• Differentiation failures. Assumptions about attendee motivations “hampered POET and the Community Response Group (CRG) in appropriately identifying potential instigators of violence.”

The report does not contain legal conclusions. It explicitly states it is not a consensus product. OPA conducted seven separate investigations into officer misconduct allegations from May 24; the SER does not report their outcomes.

The Seattle Times reported additional detail not in the OIG summary: POET deployed 4 officers when 10 were deemed necessary, SPD’s LGBTQ liaison position was vacant, and CRG officers violated the City’s crowd-control policy requiring targeted arrests of “bad actors” after isolation, instead deploying bicycle officers to arrest identified individuals without isolation or dispersal opportunity.

Status

The SER is published but the panel was discontinued before consensus on contributing factors or recommendations. OIG stated it “will continue to support SPD efforts to expand dialogue policing and improved demonstration response” but no implementation tracker, deadline, or department-by-department status update has been published. The seven OPA investigations from the Event are not publicly tracked through to outcome in materials reviewed for this entry.

The Federal Consent Decree that governed SPD oversight for 13 years was lifted in September 2025. The Cal Anderson Event was the first major test of the local-only oversight system that succeeded it.

Chief Shon Barnes, at an SPD LGBTQ Advisory Council meeting, publicly blamed Seattle Parks and Recreation for the late permit notification and incorrectly attributed SER panel selection to the Community Police Commission; CPC staff publicly corrected the attribution.

Why it’s in the registry

The Cal Anderson SER sits next to the Diaz misconduct case and the SPD overtime overspending case as a third SPD entry, and connects to a fourth structural pattern: the durability of Sentinel Event Review findings across multiple SER waves (Waves 1-4 in 2021-2023 covering the 2020 protests, and now this Cal Anderson SER in 2026). The Seattle Times observed that “many of these recommendations echoed findings from previous in-depth assessments.” Repeat findings five years apart, separated by the consent-decree exit, raise the question of whether structural recommendations from a non-binding panel review process can drive change without binding-finding authority underneath them.

The other reason this is in the registry is the process failure. A single panelist’s confidentiality breach was sufficient to terminate the review and prevent consensus recommendations. That fragility is itself a governance question about whether a sentinel-event panel is the right post-consent-decree accountability vehicle, or whether OIG needs binding-finding authority equivalent to an Inspector General with subpoena power.

Reform implication

Two distinct reform lines run through this case.

The first is the durable-implementation problem. Sentinel Event Reviews have now produced over 100 cumulative recommendations across five waves (Waves 1-4 plus Cal Anderson). The Cal Anderson panel found many of the same factors that prior waves found. The reform mechanism is not more reviews; it is binding implementation tracking with statutory teeth, so that a recommendation accepted by SPD or the Mayor’s Office cannot quietly lapse without a reportable status change. See [reform: federal_oversight_response].

The second is the OIG-PSCSC structural-authority question. The federal consent decree gave a court-appointed monitor binding authority over SPD compliance. The local successor system is OIG plus OPA plus CPC. The Cal Anderson Event tested that system within months of consent-decree exit. The system produced a useful but non-consensus report and seven OPA investigations whose outcomes are not publicly tracked. Whether OIG-PSCSC should have stronger binding-finding authority, additional staff, or a separate Council-level reporting line is the structural question this case raises. See [reform: independent_inspector_general].