For the third debate, September 12-13 in Houston:
---met both criteria (fund-raising, polls)
Biden
Buttigieg
Harris
Sanders
Warren
Booker
O'Rourke
Klobuchar
Yang
---met fund-raising criteria only
Castro
Gabbard
---met no (fund-raising, polls) criteria yet
Steyer (no donors reported yet)
Gillibrand (>100,000 donors on August 6)
Hickenlooper (~13,000 donors on July 2)
Bennett (~28,000 donors on June 30)
Bullock (~17,000 donors on June 30)
de Blasio (~7,000 donors on June 30)
Inslee (>110,000 donors on August 5)
Messam (no donors reported yet)
Moulton (~14,000 donors on June 30)
Ryan (~13,000 donors on July 12)
Sestak (no donors reported yet)
Williamson (116,435 donors on August 7)
https://en.wikipedia.org/wiki/2020_Democratic_Party_presidential_debates_and_forumsAll who qualify for the above (third) debate automatically go to the fourth debate in October.