So in my case I started talking to a girl yesterday off tinder and went well but I'm wondering do I wish her a happy thanksgiving and start a convo from there or ask how her night was?

But more generally, how soon before it's okay to wish girls a happy holiday and it's not "weird" or whatever?

Edit: any advice for how to leave things with us college folks leavin for school but not wanting to lose touch with them even if there's no "spark"?