Translation of verständigen

Work was performed only in June, July, August and September. In October and November, Erik has been waiting for Katja's visit and Sabine was on maternal leave after Christmas and New Year.
In plural there is no difference between the formal and the colloquial address form. Do you mean that you are using 3rd person singular form for the plural imperative? If so, I will change all entries so far.
I play the flute, but in recent years, I had no time. My granddaughter will give birth in 2 weeks and I will be great-grandmother. But I am only 70 years old. I hope that does not scare you.