MyPanera Rewards members (not to be confused with YourPanera or OurPanera) have the chance to be offered a free bagel every day for the month of October!
Simply log into your account each day to see if a free bagel is listed in your rewards or you can check your email for a daily notice from Panera.
If you receive either of these, take your Panera card into the store that day and you'll get a free bagel (without any spread.) Who gets the freebie is randomized each day, so make sure to check your account / email every day this month.
If you dig this offer, you'll probably enjoy Panera's birthday freebie offer too!