For the stock market I have always heard "Sell in May and go away" and it seems to be pretty much true. For forex though, since the trading is worldwide instead of just a US exchange, and like people have said it trades TRILLIONS of dollars per day, there isn't really a volume issue there. You want to avoid trading on Christmas, Easter, etc but assumedly you would be busy and taking that time off from trading anyway.
For July, big days you may want to consider taking off from trading would include today for USDCAD (Canada Day), July 4th for all US trading pretty much, and JPY for a Japanese holiday on July 21st.
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