I think that's sweet. I don't see why you wouldn't want to go. You know, all thru growing up my mom never wanted to do things like that with my dads family and somewhere down the line we all get left out of the events. We went less and less until we stopped getting invites. My advice would be to enjoy those times. Not everyone is blessed with in-laws that want them around so much.
Each person's family functions differently, some families spend more time together than others. When you get married, there is often friction with your spouse's family but it is very important to talk to your spouse about it honestly. If you feel that all the family gatherings are too much for you, let your Husband know that you are uncomfortable with it. In my opinion, it is vitally important that you are open and honest with the person you are married to.
In my opinion, it is only good to get out of it if your spouse agrees- never good for the marriage if your spouse starts going to Fam function without you! Compromise+compromise+ compromise= Happy Marriage :}
In order to keep the peace, you cannot get out of going. My husband's family made occasions out of everything, and I would bellyache the entire ride about too much togetherness. One day I realized that, aside from my crabby mother in-law, I enjoyed the family gatherings, having no close family myself. I have learned to cherish my husband's siblings. I hope someday you can too