Only these wealthy people are able to hold charity cause events, while poor ones may want it but unfortunately their finances are not capable either.
However, if ask if it’s just for publicity stunt, maybe for some especially for those who want to claim the limelight, but let’s not forget that there are still genuine and humble wealthy people, and all they want is really to help and share their blessings, not to pretend for the sake of public attention. These kind of people are actually real wealthy but fake ones only aim to deceive, not to help.
Sometimes such things will be done in order to gain publicity for them to be more famous, by holding charity events but not all are like that, it's just that they take advantage of the opportunity to further improve their careers in certain fields, to achieve what they want even though it sounds good enough, but not all are like that, there are still many rich people who are generous and give without being caught.