Suggestions for blocking a lace hat

I’ve made this Fountain Hat from Knitting Daily
I’m not sure how to block the lace pattern open without stretching the ribbed band.
Any suggestions would be very welcome!

Happy Holidays to all the Woolies out there!

You know, I’ve knitted hats with lace before and never worried about blocking them because wearing them seems to open the lace up.

But thinking about it–I wonder if you could get a styrofoam ball from a craft store and put it over that to block–that way the ribbing would hang down and not get stretched.