The last time I VJed two nights in a row, it was in my hometown for Oosthoek Live 2019. This weekend, at Kavka Zappa venue Antwerp, I was in for a similar treat with the Bad Habitz Weekender edition.
The thing with gigs spread over multiple consecutive days, is that you have to plan ahead how you're going to spend your energy. And perhaps more importantly, when you'll be able to recover some of it.
For example, if you know that you'll not be able to rest properly in between two days, you better don't give your all on day 01. Rather save some for day 02 as well, then you're all set. :)