How about this?:
(from http://www.conventionofstates.com/can_congress_block_a_convention_of_states)
Can Congress Block a Convention of States?
Answer:
No. As long as each states applies for a convention that deals with the same issue (i.e., limiting the power and jurisdiction of the federal government), Congress must call the convention. Congress can name the place and the time for the convention to begin. If it fails to exercise this power reasonably, either the courts or the states themselves can override Congressional inaction.
Why do you believe applications must pertain to the same issue?