Ten of the 17 events cancelled over five years due to costs were in Tower Hamlets, new figures show.
Deputy Malcolm Ferey says "sharing these reports demonstrates our commitment to openness".
The government says the number and complexity of requests hit a record high in 2025.
Thousands of PSNI staff had their names shared after an FOI request had been made and information was posted online.
Westminster Council says most overpayments occur when an employee leaves after the payroll cut-off date.
A response to a data access request "lacked clarity", a watchdog says.
Liverpool City Council is given a contempt of court warning over its handling of FOI requests.
Figures show answering FOI requests on time has barely improved since a 2024 enforcement notice.
Campaigners call for an investigation into a unit within the National Police Chiefs' Council.
