The OP is not asking about the various merits of learning the local language or not, but whether he would 'get by' without. (Whether initially or long term) The answer, for Zug, anyway, is yes. I work for a global company and would say that only a small number expat staff speak German.
I'm not sure how 'official' a parent teacher discussion is. My daughter's teachers, for instance, always offered to switch to English for me, although I speak German, so it wasn't necessary. The school even had a multi lingual evening this week for parents.
Maybe that's the practice in Bern. Although I always deal with officialdom here in German, I know many non-German-speakers in Zug who get by swimmingly, and not heard of them ever requiring translators.
That may be an illustration for the OP just how different the cantons can be.
They're good like that. Very welcoming.
The fact that my village is a third expat is also a motivating factor! In all seriousness though, I have been so impressed with the school. (It almost feels like a private school)
Is the job offer with your current employer?
Have you been offered a look/see visit?
Is your potential employer offering relocation support? Finding a place to live in Zug can be difficult. Your housing budget can affect this greatly.
Not all spouses can find suitable employment. This can be the situation for either spouse. While there is a shortage of teachers in the Swiss public schools, this is not the case in private schools.
Thanks. I'll bear this in mind.