Right? is not the tag ending to use after an imperative
sentence beginning with Let's. When you make
a sentence beginning Let's, and you want agreement
from the person or persons you are speaking to, you can say OK?
or Shall we?, or possibly a few other expressions,
but not Right?
Right is often used as a tag, informally, in declarative
sentences like these:
We're meeting at 10:00 tomorrow,right?
Bob passed his examinations, right?
The planes aren't flying, right?
They haven't accepted our offer yet, right?
We'll hear from you again,
right?