OK. Someone schedules a meeting/training which is beyond your contracted hours, but you are required (contractually) to attend.
Is it reasonable that they 'notify' you of this, simply by putting it onto a shared electronic calendar that you have access to? But they don't inform you (by email) of the dates, but simply wait for you to notice that it's on there.
This entails staying behind 2.5 hrs beyond normal working hours.