2 Questions about the summer event

1. Yes there will be, that will happen when part 2 of the event is released
2. I can’t say I would know, though storm difficulty nodes are probably your best bet.

I think all the storm nodes have the same drop rate of the CE. you should just farm for event currencies normally and if you're lucky enough, you'll get a drop

I got 2 CE in the beach. hope this help you