Is going to collect money from someone to book a mixed trip, on behalf of a busy brother, considered aiding in a forbidden evil?

It is impermissible to participate in trips organized with the intent of bringing together unrelated young men and women due to the temptation and corruption they entail. However, if the trips are organized for a permissible purpose and involve mixing, there is no harm in collecting subscriptions from some individuals, as long as there is no intention or direct involvement in facilitating forbidden mixing.