Looking at upcoming closures noticed that the District is closed Monument-Stepney Green after 10am on the 26th plus the Circle from Euston Ssq-Monument & the H & C from Euston Sq-Monument (via Victoria).Last time I checked there's no reversing points at any of these stations.
They're all one stop from reversing points though, so it's possible that the trains will continue out of service to reverse. This can happen if for example there are station works that prevent safe passenger egress but nothing affecting the trains. It seems very unlikely though that this would happen at this many locations on the same date.
The essential things in life are seen not with the eyes, but with the heart. --Antoine de St. Exupery