Translation of Halbzeit

Can we meet on the March 4 or 5 (Tuesday or Wednesday) in Cologne? I am delighted to see you again soon. We are in the beginning of March and we look forward to seeing you next week. Here's a photo.
Maybe we would need to say install our dictionary as a software? But I would say instead of install, use our dictionary as a software. So bottom line. If I use the singular form for newsletters and websites, I am on the safe side for both?
I'm learning German for a year. I do not write well, but I hope to improve soon. This is precisely why I want to make friends on vocabulix. In August I will fly to Berlin, it will be my first time.