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I have done all 3 days of revival for the last 4 years, as a GRRC member.
Friday is "more quiet" than the other days. It is still busy, but mostly feels like corporate days out and guests so the bar queues suffer more than anything. Generally all the groups run, but it is practice so there is no really exciting track action.
Saturday is busier, qualifying is on for almost all groups and the first race runs in the evening - it's normally a 2 driver 45-minute job so if you are using the whole day it's quite good! Saturday has the biggest focus on the Revival things like dressing up (as far as scheduled events go). I normally go with the girlfriend on Saturday.
Sunday is best for track action with it just being racing, but also it is busiest.
If you can do the Kennels package and are doing a day, I would go Saturday - Food at the Kennels is really good, solid parking is a bonus (I'm taking our series 1 if the weather is mixed this year, and the Defender again if it is shit, so no car park fears.) but the other thing on the Kennels package is the paddock pass - Make sure you have a jacket and tie as they get picky about it. but you do get to have a look up close at some really special cars.
Hope that helps
I'm looking at the hospitality packages too as it coincides with our wedding anniversary. The Kennels only offers Friday or Saturday, but looks pretty good value and I don't have to park in a potentially muddy field.