The phrase "an ancillary activity" is correct and usable in written English.
It can be used to refer to a secondary or supplementary activity that supports a primary activity or goal.
Example: "The workshop included an ancillary activity that allowed participants to network and share ideas."
Alternatives: "a supplementary task" or "a secondary activity".
Whitewater rafters might slide a stream as an ancillary activity.
But she fears the neighbourhood's younger generation is more tuned in rapping as a form of aggression – notably in rap battles – and, worse, as an ancillary activity to drug dealing.
The F.A.A. is part of the Transportation Department, but is now widely viewed as having been too accommodating to the airlines, which generally saw security as an ancillary activity with no possibility for profit.
As a result, 'making conjectures' could be seen as an ancillary activity.
"Sometimes it feels like crime is an ancillary activity for us - and to some extent crime is relatively straightforward.
Companies may have previously outsourced a few ancillary activities like building maintenance or specialized legal work, but now they were beginning to outsource major capabilities involving thousands of people.
In the casinos of Las Vegas, only 26% of revenues come from gambling, the rest from ancillary activity including shows, dining and shopping, says Gabriel Chan, an analyst at Credit Suisse.
The point is, this unprecedented ancillary activity has all been based around what essentially is just a single episode of a long-running drama.
Over the course of the past two years, The Washington Post has compiled timelines documenting what is known about various aspects of the investigations into Russian interference in the 2016 election, interactions between President Trump's campaign and Russian individuals, and ancillary activity that resulted in criminal charges obtained by special counsel Robert S. Mueller III.
The answer is six main initiatives, with a couple of ancillary activities tacked onto the end.
One day earlier, on 17 November, Pinsar Petelur Nasional (layer farming organization / PPN) for Kendal, Central Java area organized a farmers meeting on AMR with ancillary activities including egg/chicken cooking competitions, a bazaar and a traditional Wayang puppet show featuring AMR in the storyline.
