If they are I can assure you that they are fully committed in the event that you do get there and wait in line to get to the park ranger he'll offers you a voucher to come back at a later time if there is availability
If they are open it will be packed and you won't be able to get in.
It should be but lately you have to get there early in order to even get in
If I had to guess , I would say no
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