Will the summit actually progress towards peace?
I don't see how these high level meetings get close to peace. That does not mean they should not try. Dictators, by definition have absolute power and absolutely will not give it up. If Kim Jung Un does reach a deal, he will have to push the international community for immunity since there are known crimes against humanity. My guess is those are just the tip of the iceberg.
The underlying question is do you sellout your morals to appease a regime into a deal of questionable danger from unclear intelligence about nuclear warheads with no reliable delivery system?
Not convinced there is evidence to support the seeming supposition that Trump has morals, or that (like some politicians) he simulates having them.
Without such a supposition, the likely outcome of the summit — if it happens — becomes even harder to read, because it's unclear what Trump's motives are, as well as questionable whether he —or, in fact, anyone— would be competent to achieve them.
If I was trying to make this happen, I would for look for a neutral party that both side respected as a moderator and can ensure adherence to any agreement. Immediately you cross out the US, China, and Russia. The only one that comes to mind is Germany's prime minister Angela Merkel.
A first move forward would be the North removing artillery from the DMZ and the US buy back the THAAD III missile defense shield. That is a tall, VERY TALL order.