gistfile1.txt

query: 

query getEvent {
  listEventInstances (filter: {date: {eq: "2020-03-11"}}){
    items{
      id
      date
    }
  }
}

resolver:

#set( $limit = $util.defaultIfNull($context.args.limit, 10) )
#set( $ListRequest = {
  "version": "2017-02-28",
  "limit": $limit
} )
#if( $context.args.nextToken )
  #set( $ListRequest.nextToken = $context.args.nextToken )
#end
#if( $context.args.filter )
  #set( $ListRequest.filter = $util.parseJson("$util.transform.toDynamoDBFilterExpression($ctx.args.filter)") )
#end
#if( !$util.isNull($modelQueryExpression)
                        && !$util.isNullOrEmpty($modelQueryExpression.expression) )
  $util.qr($ListRequest.put("operation", "Query"))
  $util.qr($ListRequest.put("query", $modelQueryExpression))
  #if( !$util.isNull($ctx.args.sortDirection) && $ctx.args.sortDirection == "DESC" )
    #set( $ListRequest.scanIndexForward = false )
  #else
    #set( $ListRequest.scanIndexForward = true )
  #end
#else
  $util.qr($ListRequest.put("operation", "Scan"))
#end
$util.toJson($ListRequest)