Overreacting about In-laws?

So we live about a 5-hour plane ride from my husband's folks. They came over yesterday to visit their soon-to-be 4-week-old grandson. We live in about urban area so we only have a small 2-bedroom (one bedroom for us, the other for baby and our office). In my husband's culture (Filipino), it's expected that family stays with you, not in a hotel. So they're staying in the living room on our sleeper sofa that we bought in preparation for them. I'm not the biggest fan of my MIL.

Today, my MIL asked my husband if we're baptizing our son (we're catholic). He said we're hoping too. Then she asked him to plan the baptism the same week as his first birthday. All the baptisms I've been too took place before baby was 9 months, so that's what we were planning, but I guess it could be later depending on the Parish. But part of me is annoyed at my MIL. We had to change our wedding date a couple years ago because of some Filipino superstition that had her in tears. Now she wants to tell us when to have the baptism for our son. Plus we're most likely going to have to host them during that time, which could be steal stressful given that babies' first birthdays can be huge parties of upwards of 200 people in my culture and where we live.

I get that she wants to be there for her grandson, but should we be planning this all according to her wants? Am I being totally crazy for being frustrated? Is it just the fatigue and having someone in my space that's getting under my skin?