Based on rotations I've seen for other cruises, if you start in Marvel, you'll go to Coco, then 1923. Of course, that could be different for your sailing.
We did get 1923 for our first night and marvel for formal night. Do note if you have the second seating they close the Grand hallway staircase photos before 10 pm. We rushed to get there at 9:50 pm (allergy orders) and the Grand hallway was almost empty.
Just a side note: there was communal seating at 1923 (marvel was very close as well). We had requested a private table (due to disabilities) but saw another party having issues. The servers tried their best to rearrange and slightly separate a table, but something to be aware of.
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