What can we do for mothers day? 10 points?

My mom died in march of this year. My dad was married to her for 30 years. Hes gonna be sad. He comes home from work around 5pm on mothers day. Is there anything we could do? Its gonna be the first mothers day without her. She was cremated so we cant go her gravesite since shes in an urn in our dining room. I wanna spend time with my dad. Any ideas? Im only 17 so i dont have much money. Thanks