Here are some ideas to please everyone and keep cool with parents, in-laws and the such:
Get everyone together- It's awesome if possible, but too few families can actually survive the blast. Plus, if you start adding every-single-one-of-your-relatives, it might come out to a Disney sized family reunion.
Different families, different dates- Isn't the whole point of these celebrations being together? Then people shouldn't be so upset if you need to do it on the day or the week before/after. Unfortunately, everyone involves needs to be super mature to handle this, which doesn't always happen.
Yearly rotation- I've been doing this with my mom and mother-in-law. Spent last year's Easter with mom? This year with the in-laws. In my opinion, it's fair. Just remember to give people plenty of time by reminding them this is not their year.
Alternative celebrations- Not everyone celebrates Christian holidays. Not every families have mothers and fathers still living. If that is the case, adapt your celebrations to what matters most to people, and share their special holiday with them.
Hit the road- Who hasn't been so stressed by planning a Christmas dinner that they vowed never again to do it? If you trully need a rest, run away from everyone by taking a trip. That way, no one can complain because you've ditched both sides of the family.
Whatever you choose to do, just remember to keep feelings in check, and talk about it instead of simply announcing it.
