It doesn't seem appropriate to call it happy...but what adjective should go there instead? Thoughtful Veterans' Day? Or should it be a command, Remember Veterans' Day? That sounds condescending, like I am sure you would forget otherwise. I don't even know if I'm putting the apostrophe in the right place. My calendar has no apostrophe.
OMG Did you know Jennifer Love Hewitt is the National Veterans(') Day spokesperson! I love her boobs...I mean her work! God bless her. I really do think she's kind of adorable, and now more respectable than ever.
And there's a FAQ to answer my question about the apostrophe:
Q. Which is the correct spelling of Veterans Day?
a. "Veterans Day"
b. "Veteran's Day"
c. "Veterans' Day"
A. Veterans Day (choice a, above).
Veterans Day does not include an apostrophe but does include an "s" at the end of "veterans" because it is not a day that "belongs" to veterans, it is a day for honoring all veterans.