Cassandra Peterson Instagram – Midsummer Scream is (a little too) excited to welcome back Cassandra Peterson, aka Elvira, Mistress of the Dark @therealelvira ! (Ms. Peterson will be appearing as herself, on Friday and Saturday only) Midsummer Scream returns to the Long Beach Convention Center, July 26-28. Save 40% off general admission for a limited time at midsummerscream.com or via the link in our bio!