math:
language:
books:
science:
arts/crafts:
Physical/ games:
songs:
social/emotional:
you can fill out as much as you know .. websites welcome 
thanks
I can definitely answer this question since im still in elementary school! Ok:
Math:You can like cut out little heart shapes and teach them adding and stuff.
Language:
Books:I know books you can read to them that i LOVED when i was in kindergarten:
I loved "Franklin’s Valentines",The Bernstein Bears Funny Valentine book i loved those!
Arts/Crafts:My favorite! Ok i have a whole bunch of ideas for this one!
Have them make like little Valentine’s day cards for their friends and Family
Then for the girls you can use like glitter and stuff and for the boys do anything also you can have them paint a picture of who is the most special person in their lives and stuff
Physical/Games:I also love this one:You can have them do this:1. Valentine’s Games: Catch My Heart
This is one of those Valentines games that don’t require much set up — just some bean bags and some room for kids to move around. (They can also sit and catch the bean bags if you’re tight on space.) Best of all, this Valentine’s party game gets kids moving, which is always a good idea for a winter party, when kids are less able to work off all that kid-energy outside.
2. Valentine’s Games: Valentine’s Day Storytelling
If you love kids’ Valentines games that are not only super-fun, but an excellent way to exercise kids’ imaginations, you’ll love this Valentine’s Day party game. Kids work together to make up their own story Mad Libs-style, and will laugh at the silly tale they create at the end.
Songs:Have them like Make up songs.Choose a tune to a song and like if the have ideas for a line write it down and in no time you have a song
Social/Emotional:Have them get in to little groups and talk and stuff and Bring like cookies they can talk and eat.
There are some websites also i put for you so i hope this helped!
Have an Awesome V-day
Which is My birthday
~Me♥
I can definitely answer this question since im still in elementary school! Ok:
Math:You can like cut out little heart shapes and teach them adding and stuff.
Language:
Books:I know books you can read to them that i LOVED when i was in kindergarten:
I loved "Franklin’s Valentines",The Bernstein Bears Funny Valentine book i loved those!
Arts/Crafts:My favorite! Ok i have a whole bunch of ideas for this one!
Have them make like little Valentine’s day cards for their friends and Family
Then for the girls you can use like glitter and stuff and for the boys do anything also you can have them paint a picture of who is the most special person in their lives and stuff
Physical/Games:I also love this one:You can have them do this:1. Valentine’s Games: Catch My Heart
This is one of those Valentines games that don’t require much set up — just some bean bags and some room for kids to move around. (They can also sit and catch the bean bags if you’re tight on space.) Best of all, this Valentine’s party game gets kids moving, which is always a good idea for a winter party, when kids are less able to work off all that kid-energy outside.
2. Valentine’s Games: Valentine’s Day Storytelling
If you love kids’ Valentines games that are not only super-fun, but an excellent way to exercise kids’ imaginations, you’ll love this Valentine’s Day party game. Kids work together to make up their own story Mad Libs-style, and will laugh at the silly tale they create at the end.
Songs:Have them like Make up songs.Choose a tune to a song and like if the have ideas for a line write it down and in no time you have a song
Social/Emotional:Have them get in to little groups and talk and stuff and Bring like cookies they can talk and eat.
There are some websites also i put for you so i hope this helped!
Have an Awesome V-day
Which is My birthday
~Me♥
References :
http://www.thebutterflyrainbow.com/preschool-valentinebooks.html
http://www.teachervision.fen.com/valentines-day/teacher-resources/6673.html
http://childparenting.about.com/od/funcelebrations/tp/Valentinepartygames.htm
http://www.kinderplans.com/admin/images/valentines.pdf