Translation of destabilize in German

The proposed date is fine. I suggest to work in small groups first, optimize the results and then do a presentation to a larger crowd. Everything can be done online these days so that we just need a PC.
No problem with the statement you sent me! They need to fill in some forms on the main page, which they will do tomorrow. Please send me all German lessons and guidelines for inserting the expressions.
I made plans to visit a surfing contest with a girl that I have met on the first day. We agreed to meet at ten in the morning at her place. I couldn't keep my eyes open and decided to quit.