It looks like your maple has symptoms of anthracnose, phyllosticta, and Taphrina spp., several fungal diseases. This spring's extended wet, cool weather has been favorable for fungal disease development and we are receiving numerous reports of similar issues in shade trees (especially maples) from various locations around the state. Fungicides are not effective for curing the symptoms that are already present. Mature shade trees typically produce so much foliage that they can tolerate some leaf damage/loss and still be fine. As long as the tree still largely has green foliage, it can continue photosynthesis and produce energy to sustain its growth. No treatment is necessary. Rake up any fallen leaves and dispose in the trash.
https://extension.umd.edu/hgic/topics/shade-tree-anthracnose-trees

Christa

Many thanks Christa!!!

You're welcome.