Renaming an integrated NXT event

For GiveCampus integrations and API.

The integration stores and updates the NXT event by its external ID, not its display name. Renaming the same NXT record does not itself change that linkage. A later GiveCampus event update/resync can send the GiveCampus name again and overwrite the NXT title. Current event export shortens names longer than 50 characters to 47 plus an ellipsis. Preserve the original record/ID; deleting/recreating is a different operation.