Where to go: Advent in Zagreb

Hello Croatia! I will be coming to Zagreb over the weekend for some christmas spirit. I would like to know, what are some must see/go spots in the city? Is there like a promenade with those little christmas houses that sell christmas stuff and wine? And another question, where would you recommend to park my car? It would be ideal to park it somewhere safe and close to the center of the city. Do i need to pay with coins or can i also pay with my phone? Thanks for all the info!