When are the routes for the festive tram in Riga?

Hello! I have to film the holiday tram for my school work, and I wonder if anyone knows which days it runs on which route?

I have noticed that for two consecutive Mondays I see it at the same time on Monday morning, from which I conclude that every Monday it has traveled the 1st tram route. Yesterday, I heard from a couple standing next to me that they had been on route 11. Today I found on the map that it is on route 7. Logically, I conclude that it runs a different route every day, but I can’t find on which days it has which route.

I can only hope that it will drive in what I need only at the beginning of each day.

So if anyone knows, I would greatly appreciate your information.

Thank you!