Is there a flexible working contract you can look into? I’ve returned to work now and have done a flexible working which has amended my regular contractual hours and days to what I CAN do and attend
I wouldn’t attend them and ask them to reschedule. I used to work Monday to Friday. But now to Monday-Wednesday and all my meetings etc are scheduled for my working days. Maybe your manager forgot that your off two days
So I’m working Tuesday, Wednesdays and Fridays and my manager has scheduled both a team meeting and training day on two different Thursdays. I’ve emailed HR I’m hoping I’m not expected to go.
What does your contract say? If your contract says you work only Mondays-Wednesdays then you can push back and say there has been an oversight and I cannot work these days. If your contract says you’re expected to work other days ‘as required’ then it might be harder to argue. However, is it possible your manager has simply forgotten / been careless - it’s always worth talking to them about the situation before escalating it further.