"when arranging" is correct and usable in written English.
It is used to indicate the act of making plans or making arrangements. For example: We must take into account all the details when arranging the wedding reception.
When arranging the conference, organizers included a wide variety of topics, including coffee meant to improve brain energy, mindfulness and robotic prosthetic limbs.
When arranging marriages between families, the whole arrangement might be jeopardised if the heads of the families, i.e. the patriarchs, or other male members, suspect the young female of having been sexually active before marriage.
This research will help HHC companies to make appropriate decisions when arranging their vehicle scheduling routes.
When arranging an informational interview, remember that you are the interviewer.
Particularly in the vicinity of airports, and particularly when arranging for landing or takeoff, clear communication is essential.
He left almost no major original works; he was most inspired when arranging melodies not his own.
When arranging flowers, all foliage below the water line must be removed in order to prevent bacterial decay and the resulting unpleasant odour.
We are proposing an amendment to the Care Bill which would make it clear that local authorities would have to consider a person's wellbeing when arranging their care".
Please verify your @princeton and @cs.princeton email addresses, along with any others you may use when arranging travel or submitting expenses.
This was not so unusual in classic musicals from the period, strange though it seems today, when arranging a first date can involve months of electronic communication.
As I always do when arranging a demonstration I posted a message on Facebook, calling on people to celebrate the Tunisian uprising on 16 January.
