The phrase "addition to a flurry" is not correct in standard English usage.
It seems to be a misphrasing; the correct expression would typically be "in addition to a flurry."
Example: "In addition to a flurry of activity, the team also faced unexpected challenges."
Alternatives: "along with a flurry" or "besides a flurry."
In addition to a flurry of discounts from hotels and resorts, many companies are rolling back cancellation penalties, slashing booking deposits and promoting money-back guarantees to encourage hesitant clients to put something on the books.
In addition to a flurry of anti-American statements from senior government figures, officials in Islamabad leaked the name of the C.I.A.'s station chief, and asked the Pentagon to withdraw some military advisers.
Yahoo, in addition to launching a flurry of new products in the last few months (and the pace seems to be accelerating), now owns the two most important tagging properties on the web – flickr and del.icio.us.icio.us
Techcrunch wrote "Yahoo, in addition to launching a flurry of new products in the last few months (and the pace seems to be accelerating), now owns the two most important tagging properties on the web – flickr and del.icio.us".icio.us
With only one month since the failed Turkish coup, President Recep Tayyip Erdogan managed a flurry of diplomatic activities with Russia, Iran, and Israel this week--in addition to an upcoming visit by the U.S. Vice President Joe Biden on August 24th.
In another addition to the flurry of reports published this year, Theresa May also released the long-awaited "Angiolini Review" into deaths in custody.
In addition to the flurry on Twitter, Stephen Colbert mocked "Ebolapalooza," and Teju Cole riffed in the New Yorker, "You need to understand that Ebola (the Obama of Osama, but don't quote me) is literally the 'Some of my best friends are black' of #NotAllMen".
In addition to Web sites, a flurry of mobile phone apps aim to make background checks as quick and easy as ordering a pizza: Just plug in a couple of facts like a name and birth date.
This will inevitably lead to a flurry of showboating chairspins.
Huge oil revenues have led to a flurry of infrastructure and reconstruction projects.
