fullcalendarでDBに保存した予定を表示させたい

Question

前提・実現したいこと

rails初心者で初投稿です。よろしくお願いいたします。
railsでfullcalendarのgemを使って予定表アプリを作成中です。
予定を追加してカレンダー上で表示させたいのですが、追加した予定がカレンダーに表示されません。
DBへの保存は確認済みです。

発生している問題・エラーメッセージ

ローカルサーバー内

Processing by EventsController#create as HTML
  Parameters: {"authenticity_token"=>"cSpQFKtrYoiS7CIJM2OH/Ch1eEmmUojJ776LgQlnLOR3GEJ8K6vS4+q6KTM1UdtvK+ZGbQ+NcFbcNAI4woI1PA==", "event"=>{"title"=>"テスト15", "start_time"=>"2021-01-09T20:45", "end_time"=>"2021-01-09T22:44", "body"=>"テスト15", "consumption"=>"", "item"=>"0", "user_id"=>"1"}, "commit"=>"登録する"}
Unpermitted parameter: :item
   (0.3ms)  BEGIN
  ↳ app/controllers/events_controller.rb:38:in `create'
  User Load (0.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  ↳ app/controllers/events_controller.rb:38:in `create'
  Event Create (0.3ms)  INSERT INTO `events` (`title`, `start_time`, `end_time`, `body`, `user_id`, `created_at`, `updated_at`) VALUES ('テスト15', '2021-01-09 20:45:00', '2021-01-09 22:44:00', 'テスト15', 1, '2021-01-09 11:44:27.221455', '2021-01-09 11:44:27.221455')
  ↳ app/controllers/events_controller.rb:38:in `create'
   (1.2ms)  COMMIT
  ↳ app/controllers/events_controller.rb:38:in `create'
Redirected to http://localhost:3000/events/36
Completed 302 Found in 11ms (ActiveRecord: 2.3ms | Allocations: 4382)


Started GET "/events/36" for ::1 at 2021-01-09 20:44:27 +0900
Processing by EventsController#show as HTML
  Parameters: {"id"=>"36"}
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
  ↳ app/controllers/events_controller.rb:80:in `move_to_index'
  Event Load (0.3ms)  SELECT `events`.* FROM `events` WHERE `events`.`id` = 36 LIMIT 1
  ↳ app/controllers/events_controller.rb:76:in `set_event'
  Rendering events/show.html.erb within layouts/application
  Rendered events/show.html.erb within layouts/application (Duration: 0.7ms | Allocations: 143)
[Webpacker] Everything's up-to-date. Nothing to do
Completed 200 OK in 11ms (Views: 7.4ms | ActiveRecord: 0.6ms | Allocations: 6263)


Started GET "/events.json?start=2020-12-27T00%3A00%3A00%2B09%3A00&end=2021-02-07T00%3A00%3A00%2B09%3A00" for ::1 at 2021-01-09 20:44:27 +0900
Processing by EventsController#index as JSON
  Parameters: {"start"=>"2020-12-27T00:00:00+09:00", "end"=>"2021-02-07T00:00:00+09:00"}
  Rendering events/index.json.jbuilder
  Rendered events/index.json.jbuilder (Duration: 0.7ms | Allocations: 1000)
Completed 500 Internal Server Error in 1ms (ActiveRecord: 0.0ms | Allocations: 1325)

該当のソースコード

events_controller

class EventsController < ApplicationController

  before_action :move_to_index, except: [:index, :new, :create]
  before_action :set_event, only: [:show, :edit, :update, :destroy]

  def index
    @event = Event.all
    
    # respond_to do |format|
    #   format.html # index.html.erb
    #   format.xml { render :xml => @event }
    #   format.json { render :json => @event }
    # end
  end

  def show
    @event = Event.all
    
    respond_to do |format|
      format.html
      format.json {
        render json:
        @event.to_json(
          only: [:title, :start, :end]
        )
      }
    end
  end

  def new
    @event = Event.new
  end

  
  def create
    @event = Event.new(event_params)

    if @event.save
      respond_to do |format|
        format.html { redirect_to @event, notice: '予定を作成しました' }
        format.json { render :show, status: :created, location: @event  }
      end
    else
      format.html { render :new }
      format.json { render json: @event.errors, status: :unprocessable_entity }
    end
  end

  def update
    respond_to do |format|
      if @event.update(event_params)
        format.html { redirect_to @event, notice: '予定を変更しました' }
        format.json { render :show, status: :ok, location: @event }
      else
        format.html { render :edit }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @event.destroy
    respond_to do |format|
      format.html { redirect_to events_url, notice: '予定を削除しました' }
      format.json { head :no_content }
    end
  end
end

private
def event_params
    params.require(:event).permit(:title, :start_time, :end_time, :body, :user_id, :consumption)
end

def set_event
  @event = Event.find(params[:id])
end

def move_to_index
  unless user_signed_in?
    redirect_to action: :index
  end
end

calendar.js

// import "bootstrap/dist/css/bootstrap.css";
// import "@fontawesome/fontawesome-free/css/all.css";

import { Calendar, startOfDay } from "@fullcalendar/core";
import dayGridPlugin from "@fullcalendar/daygrid";
import interactionPlugin from "@fullcalendar/interaction";
import jaLocale from "@fullcalendar/core/locales/ja";
import timeGridPlugin from "@fullcalendar/timegrid";
import listPlugin from "@fullcalendar/list";
import bootstrapPlugin from "@fullcalendar/bootstrap";

document.addEventListener("DOMContentLoaded", function () {
  var calendarEl = document.getElementById("calendar");

  var calendar = new Calendar(calendarEl, {
    plugins: [
      dayGridPlugin,
      interactionPlugin,
      timeGridPlugin,
      listPlugin,
      bootstrapPlugin,
    ],
    initialView: "dayGridMonth",
    headerToolbar: {
      left: "prevYear,prev,next,nextYear today",
      center: "title",
      right: "addEventButton dayGridMonth,timeGridWeek,timeGridDay listMonth",
    },
    customButtons: {
      addEventButton: {
        text: "予定の追加",
        // click: function() {
        //   ('#add-event').click(function(){
        //     ('#inputScheduleForm').fadeIn();
        //   });
        
        //   ('.close-modal').click(function(){
        //     ('#inputScheduleForm').fadeOut();
        //   });
        // }
        click: function () {
          var dateStr = prompt("予定を入力してください");
          var date = new Date(dateStr + "T00:00:00");

          if (!isNaN(date.valueOf())) {
            // valid?
            calendar.addEvent({
              title: "dynamic event",
              start: date,
              allDay: true,
            });
            alert("Great. Now, update your database...");
          } else {
            alert("Invalid date.");
          }
        },
      },
    },
    navLinks: true,
    selectable: true,
    dateClick: function (info) {
      alert("clicked " + info.dateStr);
    },
    select: function (info) {
      alert("selected " + info.startStr + " to " + info.endStr);
    },

    locale: jaLocale,
    //timezone: "Asia/Tokyo",
    height: "100vh",
    editable: true,
    defaultDate: "local",
    dayMaxEvents: true, // when too many events in a day, show the popover
    events: '/events.json',
    // events: [
    //   {
    //     title: "テスト",
    //     start: "2021-01-13"
    //   }
    // ],
  });
  calendar.render();
});

index.json.jbuilder

json.array!(@events) do |event|
    json.extract! event, :id, :title, :body,
    json.start event.start_time 
    json.end event.end_time
    json.url event_url(event, format: :html) 
  end

routes.rb

Rails.application.routes.draw do
  devise_for :users
  root to: "entrances#index"
  resources :events
end

試したこと

jsonファイル内やJSファイルのevents:部分の記述を変えてみましたが変わりませんでした。
ご教授いただけると大変助かります。

補足情報（FW/ツールのバージョンなど）

ruby2.6.5