We all love eggs...I forgot about deviled...those too. As the kids got older, we also try to get more artsy.
I grew up Jewish because my mom is, but my dad isn't Jewish. So we grew up experiencing Christian holidays with his side of the family. So, we'd appreciate the gatherings from the secular side of things. As for the Kosher part, there are people who maintain a Kosher diet for religious purposes, but Kosher for Passover is an entirely different beast.
The rules of what you can eat when having to go Kosher for Passover also differ based on whether or not you're an Ashkenazic Jew or a Sephardic Jew. It's "only" for a week, but it's a week of misery to me. I know others live for it and have found very creative ways to make it all work, but I don't share their enthusiasm. During the time of Passover, we cannot eat anything deemed to be "chametz." It's usually described as anything prepared with a leavening agent, anything involving the 5 great grains (wheat, rye, barley, spelt, oats), and pretty much all other grains or foods that might trick your brain into thinking you're actually consuming these Passover forbidden foods (like rice, beans, quinoa, corn, etc.). Anything derived from these foods, like corn syrup, is also off limits. Some people will temporarily adopt Sephardic policies over Passover, because they can have things like rice and beans. As an adult, I've never been able to handle more than a 2-3 days of matzah based products without having major stomach issues (first sign I had deeper dietary issues), so I just don't do that to myself anymore.