What is the fine-grained topic of the following text: Top PAL officials, led by Chairman Dr. Lucio C. Tan and President Jaime J. Bautista, lead a toast to celebrate the airline's 75th anniversary during a gala dinner for PAL employees at the SMX-MOA in Pasay City, where the flag carrier also unveiled its new advertising campaign – The Heart of the Filipino: Shining Through – with top Filipino singers Sarah Geronimo, Bamboo and Leah Salonga as endorsers. Only return the topic.
75th anniversary celebration of PAL (Philippine Airlines) and unveiling of its new advertising campaign