Events not showing up in contact record where contact is a "participant"

Events not showing up in contact record where contact is a "participant"

When I select contacts as "participants" for an event, the event (once completed) no longer shows up under either invited events or closed activities for the participants.   (It used to.)  If I don't send an invitation, these contacts are listed as participants, but not as invitees.

As a result, now, when I look at a contact, I can't see the events he or she has participated in, which is a significant omission.  We should be able to add a contact as a participant in an event and have it show up on their record regardless of when the event is added and whether or not we use Zoho Mail to invite them.   I never use Zoho for email or invitations, and I often put events and their participants into Zoho after they have occurred. As things appear to be working now, there is no way I can get an event to show up in a participating contact's record.   

This is very frustrating.  Can it be changed or fixed?