"jam-packed day" is correct and usable in written English.
You can use it to refer to a day that is filled with activities, events, or obligations. For example, "Today was a jam-packed day of meetings, errands, and household chores."
This week, an exciting month of Columbia Connects events where Columbians across the globe celebrated their shared alumni connection wrapped up with a jam-packed day of events in New York City.
On Sunday we were back for another round of performances, and finally, after another jam-packed day, we got to that long-awaited search for the odd sock and CD, the teary farewells, and headed wearily home.
Once you've had your fill, we have a jam-packed day of live reporting from a parade of people you've probably never heard of because they come on while you're at work.
Super Bowl Sunday is always a jam-packed day full of fun festivities leading up to The Big Game.
Tuesday is always a jam-packed day, and we want to give you as many ways as possible to follow along from home.
We're here at Aol West Coast HQ this morning, getting ready for a jam-packed day pontificating about mobile platforms before our 6th Annual Summer Party at August Capital.
But if the raucous dining room on that jam-packed Saturday night was any indication, the Reids have come up with a strategy that works.
"Although the speaking schedule isn't yet set in stone, the jam-packed Monday night is also expected to include Sen. Cory Booker (D-N.J ., anD-N.J .Joe Kennedy (D-Mand). will intRep.ce Warren.
The onetime most dangerous band on the planet is now playing matinees: this is the first of two jam-packed Sunday shows, "some James Brown-type shit", as Chuck D calls it.
What might be a piece of cake on a relaxed Sunday has a high challenge level when you try to do the very same thing on a jam-packed Wednesday.
Trudeau's news conference came at the end of a jam-packed first day for the prime minister-in-waiting, which began with him surprising morning commuters at metro station in his home riding in Montreal, snapping selfies with constituents.
