I. I'm always thinking up activities and games for groups of varying ages, etc. Here are some that might work for you.
A Family Feud - choose two team members at random and then either randomly select their "family" or have volunteers. Each team should consist of 5 persons. Then make up the questions and answers. You can be the touted "studio audience" and make it easy. Questions can be relative to Mother's Day like 1) Name some famous T.V. Moms; 2) Name something that most moms do like their mother; 3) Name something that men buy for their wives on mother's day; things kids make for their mom's at school; something a mother would love to have for a gift; something June Cleaver (mom on Leave It To Beaver) would be able to tell you alot about, etc. There can be prizes for the winning team (a 6 pack of cokes for each or maybe some stationery or something). There are ways to involve the audience too. If you're interested, contact me directly and I'll be glad to share more with you.
Another more passive game might be to write the full names of two or three of the moms on a dry erase board and have everybody take a sheet of paper and pen and make up as many 3 letter words as they can utilizing the letters from the names - the one with the greatest number of unique words (nobody else had them) would be the winner.
Scavenger hunts are always fun too. You can break up into teams and give lists out of things that you have either hidden or are easily retrieved from the hotel premises for each team to come up with. Items could include - a straw, a hotel napkin, hotel matches, a pen with the hotel name, a rock, pillowcase, a hotel toiletry item, a pack of sugar substitute, a pack of coffee, etc. The fun is that all the members of each team would have to search for it together. Or for a twist, you could send out people from each team by themselves while the remainder wait and mingle and talk and then when the one that left returns give out the envelope to the next person with their item to locate on it and send them away. The first team to complete and locate all the items would win.
Name that tune - have someone download all the songs you can think of with mother in the title or about moms and then just play them and allow people to be the first to come forward and tap a bell (ring in) to name that tune.
Hope some of these ideas help.
Have fun...