Is this sentence OK? I am trying to make a sentence using "lot on my plate".
Presently I have a lot on my plate and I will be occupied for most weekends. As such I will not be registering for the "Training" class next week.
As the meaning of 'have a lot on one's plate is clear, to most speaker's of BrE at least, there is no need for the part of your sentence I have coloured red. In a more formal letter I would use only the part I have coloured green, joining the two parts with 'so'