Regarding NeroFest rewards

Also curious as this is my first time doing Nerofest how many sets of boxes do people usually clear. Trying to figure out where I will be with qp and embers.

The exhibition matches reward 7 summon tickets. They're difficult so look up videos on them. Honako Green is a good place to start

Just for future reference, since your question was already answered directly: You can always find all the reward, gacha, CE, shop information, and quest information of any event on Cirnopedia.

All you have to do is subtract about two years from the date of the event in NA in question to see how it went down in JP. There is usually very negligible difference from between what they had and what we get. Here’s the page for NeroFest 2016 (2018 for us):
http://fate-go.cirnopedia.org/quest_event_20160928.php

Have fun, I hear it’s gonna be a tough event.