Yes, you are a 100% right.

I used "daytraders" however, it is not fully correct word, sculpers are better. Guys came to make some money on the upcoming event.

Even for daytraders it is acceptable to stay in long for a while if you have some additional information (a NOT link leak to finance.google.com brought a lot of such players to this site).

But, to stay in position for a weekend could be unacceptable risk for such kind of players - too many things could happen and you can not react on time.