The Rome of Germany with many ancient ruins. Many fine German wines here.
A list of events in Trier is here https://www.trier-info.de/english/highlights-2019
Catch 9.25 plane and arrive Luxembourg City Airport at 12:15. Bus 117 at 13:15 from Luxembourg airport takes 37 minutes to arrive in Trier.
Wine in the City is on all weekend from 13:00 to 18:00 at €15 to sample at 10 tasting stations throughout the city https://www.ticket-regional.de/events_info.php?eventID=157194
The shops open today. They only open 4 Sundays in the year. See https://www.trier-info.de/english/shopping-in-trier
Catch train to Luxembourg about 15:37 leave luggage and have lunch. Number 16 bus from Luxembourg Gare takes 20 minutes to get to airport. Flight at 20.35 arriving Edinburgh 21.25
Things to Do
This site lists the top 15 things to see https://www.thecrazytourist.com/15-best-things-trier-germany/
Bike Rental is €12 a day from the main railway station
The Karl Marx museum describes Trier’s most famous native.