Egg hunts and bunnies are as “religious” as Santa Claus and reindeer… as part of the general local culture, it can certainly be done as a fun, inclusive secular thing without prosteletyzing. Purim festivals are happy to welcome people who don’t share the faith but want to share in the pastry. Don’t Muslims have some observances that are not-especially-pious where others can enjoy the food and music as a tourist?