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 You are getting this error into your plugin  Unable to cast object of type 'System.Guid' to type 'Microsoft.Xrm.Sdk.EntityReference' Your crud operation Entity field has a Lookup field relationship and it is expecting EntityReference. EntityReference conactEntityReference = new EntityReference { Id = newContactEntity.Id, LogicalName = Contact.EntityLogicalName }; localContext.OrganizationService.Update(new Entity(proevt_eventregistration.EntityLogicalName, inputEventseriesEntity.Id) { ["proevt_contactid"] = conactEntityReference });  

 If we want to call another plugin or action from plugin we can use this approach. // Call std Copy action into plugin OrganizationRequest request = new OrganizationRequest("std_Copystd"); request["Target"] = stdEntityReference; OrganizationResponse response = localContext.OrganizationService.Execute(request); string clonestdresultresult = (string)response.Results["Result"]; string ClonestdId = (string)response.Results["CloneId"];

 we can update any entity record without retrieving  String stdattendeeFetchXML = $@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'> <entity name='std_stdattendee' > <attribute name='std_contactid' /> <attribute name='std_attendeecategory' /> <attribute name='std_attendeeroleid' /> <attribute name='std_name' /> <filter type='and' > <condition attribute='std_stdid' operator='eq' value='{ClonestdId}' /> <condition attribute='statecode' operator='eq' value='0' /> ...

  Retrieve Entity record data into plugin var inputcontract = (localContext.InputParameters["Target"] as Entity).ToEntity<student_contract>(); // retrive entity data Account accountEntity = localContext.OrganizationService.Retrieve( Account.EntityLogicalName, inputcontract.student_Account.Id, new ColumnSet(new String[] { "student_eventseriesid" })).ToEntity<Account>(); // You can also set the value without entity context ["student_eventseriesid"] = accountEntity.GetAttributeValue<EntityReference>("student_eventseriesid")

 Generate the xml query using xrmtoolbox and try with this code sample. String eventsessionFetchXML = $@"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'> <entity name='baseevt_eventsession' > <attribute name='baseevt_eventid' /> <attribute name='baseevt_sessionenddatetime' /> <attribute name='baseevt_sessionstartdatetime' /> <attribute name='baseevt_name' /> <attribute name='baseevt_description' /> <filter> <condition attribute='baseevt_eventid' operator='eq' value='{inputEntity.Id.ToString()}' /> </filter> </entity> </fetch>"; var eventSessionresult =...