The first 27,000 people towill get a package of free Dave's Killer Bread Epic Everything bagels, worth up to $6. This offer is only for the continental US and ends 4/16/21, but there's no way in heck these last that long.
If the form won't submit for you, then please keep trying! I spoke with DKB's support team and they told me a few minutes ago that they have freebies remaining, however the site is getting hammered with requests.
I'm going to mark this as expired by the end of the day because I don't expect the freebies to last into the weekend. Good luck!
Update: It took me about 10 minutes of intermediately trying before the form submitted! You should get a new page that says “THANK YOU FOR ENTERING! A confirmation email has been sent to you.”