How to pass sub node id of firebase to modal

i wanted to update particular record from firebase real time database. Here i have created data list and 2 button named delete and edit.On Edit button i have called modal window.That window contain form with input field.i wanted to update record based on that modal window value.i don't know how to fetch my passed data on my modal window. here is my code.

event-list.html

<ion-list *ngFor="let event of events1 | async">
   <ion-item (click)="viewItem(event)">
     <ion-img src="{{event.event_img}}"></ion-img>
     <p>{{event.event_name}}</p>
     <!-- <p>kkk {{event.E_id}}</p> -->
   </ion-item>
   <button ion-button (click)="deleteItem(event.key)" class="button">Delete</button>
   <button ion-button (click)="updateItem(event.key, event.event_name)" class="button">Edit</button>
 </ion-list>

i wanted to update particular record from firebase real time database. Here i have created data list and 2 button named delete and edit.On Edit button i have called modal window.That window contain form with input field.i wanted to update record based on that modal window value.i don't know how to fetch my passed data on my modal window. here is my code.

event-list.html

     <ion-list *ngFor="let event of events1 | async">
    <ion-item (click)="viewItem(event)">
      <ion-img src="{{event.event_img}}"></ion-img>
      <p>{{event.event_name}}</p>
      <!-- <p>kkk {{event.E_id}}</p> -->
    </ion-item>
    <button ion-button (click)="deleteItem(event.key)" class="button">Delete</button>
    <button ion-button (click)="updateItem(event.key, event.event_name)" class="button">Edit</button>
  </ion-list>

event-list.ts

updateItem(key: string, newText: string) {
  var data = { key: key, newText: newText };
  alert(JSON.stringify(data));
  var modalPage = this.modalCtrl.create("EditEventModalPage", { data: data });
  modalPage.present();
}

edit-event-modal.ts

updateItem(nm: string, venue: string) {
   this.data = JSON.stringify(this.navParams.get('data'));
   this.fdb
   .list("/events/").update(this.data[key], { event_name: nm });
 }

edit-event-modal.html

 <ion-card>
<ion-item>
  <ion-label stacked>Event Name</ion-label>
  <ion-input [(ngModel)]="dataEvent.name" type="text"></ion-input>

</ion-item>

<ion-item>
  <ion-label stacked>Event Venue</ion-label>
  <ion-input [(ngModel)]="dataEvent.venue" type="text"></ion-input>
</ion-item>

<ion-item>
  <button ion-button icon-left clear item-right (click)="updateItem(dataEvent.name,dataEvent.venue)">
  <ion-icon name="checkmark"></ion-icon>
  Send
</button>
</ion-item>