I have not found any moon calendar similar to that in Mamari. But in the beginning of the text on side a in Keiti there could possibly be one.

My eye was caught by repetitions of glyphs indicating the Moon (of both types, open towards the left and towards the right):

On closer examination these glyphs could be arranged into 9 sequences, called by me 'periods' as if it was already clear that the text is about the phases of the Moon.

Each such 'period' is concluded with three glyphs, similar in type between the 'periods' but different in details. These three types of glyphs are showing, respectively, a person holding a kind of oval, a shape similar to half a canoe and a glyph perhaps indicating a whole canoe. The last two types of glyphs are usually, but not always, fused with a standing respectively a sitting bird-like personage. An example (from the 8th 'period'):