One day-er ? You must be getting old !Also going this Saturday - catching the train tomorrow so my Saturday is less stressful this time and I have more energy (last year Eurostar over in the morning of the festival)
I think the biggest bit of advise I would give to this event is
Pre-plan / create your own schedule.
Last year we was all over the place with no idea who to see or what times and ended up just hand picking on the day - It wasn't the best use of time and ended up borderline wasteful considering the money you have spent to attend
I will drop you a whatsapp @Tiffany Barrett on the Saturday!