Sept. 14 was a good day to be a horn player in Morristown. There were five bands at this year’s edition of the annual Morristown Jazz and Blues Festival, and four of them filled the large stage with casts of musicians that included robust horn sections. It’s a kind of maximalism you don’t see very often at free, outdoor music festivals, which often seem to be focused on rushing as many different acts onstage and offstage as possibly. The five groups in Morristown performed for a total of 10 hours (from noon to 10 p.m.) with 90-minutes sets followed by a half-hour of set-up time for the next act.