Thanksgiving With The In-laws

Many, many years ago when my husband was born, my mother in law decided to take over Thanksgiving form her mother since her son was born on/around Thanksgiving. (11/26) We had been alternating our Thansgiving every year - my parents', his parents'. Almost 2 years ago, my daughter was born (11/25). It has been on my mind since her birth that I would really like to have Thanskgiving at my house and have both sides of the family over to celebrate my husband's birthday, daughter's birthday, and my mom's birthday (11/28).
Last year my mother in law decided taht she did not want to "give up" her Thanksgiving because her brother in law and his famil would have no where to go. So, even though my husband's uncle is a drunk and his aunt is overly annoying, I decided to extend the inivitation to them so that we can all be together. When this was offered to my in-laws, they stated that they had some expectations 1- they want me to also extend the invitations to their friends and 2- they want me to leave the food out all day so that late-comers can eat and others can "graze" all day. I think that extending the inivtation to extended family is one thing, but asking me to invite your friends too is asking too much. I beleive that telling me that I have to leave food out for 6+ hours so that people can eat all day is unhealthy and disgusting!!!! One word - BACTERIA!
My husband think that this is not unreasonable and that I am the one that needs to give into them because afterall, we wanted Thanksgiving and they are letting us have it.