fix: find display_name

src/Calendar.tsx

@@ -147,10 +147,10 @@ const Calendar = ({ playerId }: { playerId: number }) => {
         {eventsForDay && (
           <ul>
             {Object.entries(eventsForDay).map(([id, sub]) => {
-              const name = players?.filter((p) => p.id === Number(id));
+              const name = players?.find((p) => p.id === Number(id));
               return (
                 <li key={id}>
-                  {name ? name[0].display_name : ""}:{" "}
+                  {name !== undefined ? name.display_name : ""}:{" "}
                   <span style={{ letterSpacing: 8 }}>{sub}</span>
                 </li>
               );