Hiding Workspace Checkbox while creating new sharepoint Event\Meeting

As per project requirement I was asked to hide a field called 'Workspace' from new event\meeting or editing existing event\meeting.  As 'Workspace' is a Cross Project Link type field so SPField.ShowInDisplayForm, SPField.ShowInEditForm etc do not work fine with this field. To fix that issue I put few lines of code in FeatureActivated() method:

 public override void FeatureActivated(SPFeatureReceiverProperties properties)

        {

            try

            {               

            SPWeb objSPWeb = (SPWeb)properties.Feature.Parent;

#region Disable Events\Meeting Workspace checkbox

SPList objSPListEvents = objSPWeb.Lists[“Event_List”];

SPList objSPListMeetings = objSPWeb.Lists[“Meeting_List”];

                                

            if (objSPListEvents != null && objSPListMeetings != null)

            {

SPField objSPFieldWorkSpace = objSPListEvents.Fields[“Workspace_Field”];

SPField objSPFieldMeetingsWorkSpace = objSPListMeetings.Fields[“Workspace_Field”];

if (objSPFieldWorkSpace != null && objSPFieldMeetingsWorkSpace != null)

            {

            objSPFieldWorkSpace.Hidden = true;

            objSPFieldWorkSpace.Update();

            objSPListEvents.Update();

            objSPFieldMeetingsWorkSpace.Hidden = true;

            objSPFieldMeetingsWorkSpace.Update();

            objSPListMeetings.Update();

            }

            }

            #endregion

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

Cheers