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In the USA, there is a longstanding dispensation for the consumption of flesh meat on the Friday following Thanksgiving Day (4th Thursday in November), otherwise, at least before the age of refrigeration, leftover turkey and such would have been wasted; and for corned beef (or whatever) on March 17th (St. Patrick's Day) if it falls on Friday.
But those are the only two of which I've ever heard. I have never heard of any such thing for Independence Day when it falls on Friday.
Incidentally, I have noticed that on Friday, whenever I smell barbecue or meat cooking, it is ALWAYS very alluring. Meat cooking always smells better on Friday, than it does any other day. It seems to me that this is a natural phenomenon due to our fallen nature and our susceptibility to temptations from the devil. As such, non-Catholics would fall under the same inclination, but not practicing the penances of the Church, would likely succuмb to the temptation, and might therefore PREFER to have such cook-outs on Friday than on other days.
Incidentally, while for them who do not believe, the sin may be somewhat mitigated in God's infinite mercy, but it does not change the fact that eating flesh meat on Friday is an objective sin, regardless of WHO does it! For it is absolutely necessary for the salvation of every human creature to be subject to the Roman Pontiff (ex-cathedra).
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