Here are my thoughts and a quick update.
The reason I tried to cap weekend spending, is that it's the most likely period where we have time to spend our weekend budget.
If we don't use it for lots of spending we'll be less likely to spend the money.
So much of our weekend spending actually went to standard living activities like, groceries, etc.... My regular weekly grocery budget was $300, but we were averaging much more, maybe $500. Changing how we shop at costco will make a huge dent. In general fruits and vegetables should come from the mexican green grocers - they cost almost half. Grandma loves the big 4 pound tubs of strawberries at $7 each, but we can buy 1 lb for $1 at the green grocers.
Our first weekend was fairly on budget, but only because I used a store credit to buy several home repair items - so I'm not sure how to really count that weekend.
Our second weekend was a failure - we spent about $500 or so. Groceries weren't so bad, but I had to buy some birthday gifts and wine to host a party so spend went up.
I'm hoping we can do better this weekend. We'll certainly see.
I still think the goal and aspiration is worth doing.