Help needed - unable to post event in the calendar

Hi

I've never posted an event in the event calendar, and would appreciate your help.

When I try to post an event, it gives me the error message "Please enter a valid Z coordinate."

The problem is that the location selection is from a drop down menu with only X and Y coordinates. I cannot change it to add a Z coordinate.

I'm trying to post a live music event in my sim (Sintra) on Sunday January 24 at noon, when Zachh Cale will be performing live. I believe I fulfill all requirements: I own the land, it is more than 512 square meters and I'm listed as a Estate Manager for the sim.

Any help appreciated! Thanks in advance,

Echelon Alcott