spring teas

The spring parties have changed each year for the past three or so years. No guarantee that they won't change again, or even be done again, but it'll probably be mid to late January before decisions are made on that by Panhellenic.
If they do them again, you should have a chance to sign up for them on the Panhellenic webpage. Check back in late January. You do have to be invited, but signing up should get you an invitation.
It is NOT necessary to come to spring parties in order to get a bid in the fall. Only around 600 women attended the 2016 parties and something like 2600 women pledged in August. So no biggie if you can't make it.