Air carrier A320 Captain reported being notified at destination arrival of a fume event in the cabin. Maintenance was requested and medical attention provided for the cabin crew.

Narrative

Upon landing in ZZZ and taxiing clear of the runway; my lead FA (Flight Attendant) called and notified me that they were experiencing a fume event in the cabin. Multiple passengers and all of the flight attendants were feeling the effects of it. Flight Attendant B felt ill enough that she vomited. I immediately shut off PACK 2 and we initiated the Procedure for removal of odor/fumes. The Lead Flight Attendant reported that she had experienced symptoms as early as 30 minutes prior to landing. As this was during descent and arrival; there were multiple power changes throughout the time period. After blocking in at the gate; I shut down engines and kept all bleeds and PACKS turned off. We notified Maintenance Control; completed the safety form; notified the Chief Pilot; and assisted the cabin crew in obtaining medical assistance. I worked with the Maintenance crew to explain what had happened. After several cycles of the APU Bleed; I got back onboard to help Maintenance identify whether the odor was cleared out. It was not and I helped them identify the specific smell that indicates a TCP (tricresyl phosphate) generated fume event. At that point; I left the aircraft and helped coordinate for the cabin crew to receive medical attention. Neither myself nor my First Officer felt any ill effects during this event.