old_contents: # from django.contrib import admin
  
  # from .models import Post
  
  
  # @admin.register(Post)
  # class PostAdmin(admin.ModelAdmin):
  #     list_display = ("title", "published", "author")
  
new_contents: from django.contrib import admin
  
  from .models import Sponsor, SponsorLevel
  
  
  @admin.register(SponsorLevel)
  class SponsorLevelAdmin(admin.ModelAdmin):
      list_display = ("name", "conference")
  
  
  @admin.register(Sponsor)
  class SponsorAdmin(admin.ModelAdmin):
      pass
  
subject: Add sponsors to admin