br Kamala Harris, the former US Vice President, is set to make a surprise appearance at the 97th Oscars, sparking a massive security operation.The ceremony, which honors firefighters and workers who battled devastating Los Angeles wildfires in January, will also feature a tribute segment that Harris might lead, given her connection to California as a former senator br While it's unclear if Harris will present an award, her presence has triggered an all-time high security lockdown at the Dolby Theatre, with sniffer dogs checking vehicles and a convoy of elite private security personnel on site.