Can we call our managers on Holidays/ Weekends?

Usually see managers doing this. Good to see them get a taste of their medicine so,… YES. 😇

Yes we should - Just have to reciprocate equally no to their calls on our holidays ;)

Drop a message, if s/he responds continue else chill pill

Assuming, the manager has company's communication software (slack/teams) logged in on their personal device, if the texts were that urgent to respond to, your Manager would have acknowledged/replied already. If they don't use slack etc. on their phone, then yup if it's that urgent you can call