I totally understood why they didn't do a senior B event last year (lack of time, having to work on the programs, needing time to look like a couple and get the feel of each other, even their test skate in the end of August was closed), but this year things have changed, for the better

, and I think that a senior B event would only benefit them: give them a chance to show their programs and change what needs to be changed early in the season, not between competitions

, add to their competitive experience together and get the so much needed points that will improve their standings and get them closer to the big guns.
Challenger Series in 2015/16:
U.S. International FS Salt Lake City, USA, September 16-20, 2015
Nebelhorn Trophy Oberstdorf, Germany, September 24-26, 2015
Ondrej Nepela Trophy Bratislava, Slovak Republic, Sept. 30-Oct. 4, 2015
Finlandia Trophy (no Pair Skating) Espoo, Finland, October 8-11, 2015
Mordovian Ornament Saransk, Russia, October 15-18, 2015
IceChallenge Graz, Austria, October 27-Nov. 1, 2015
Tallinn Trophy Tallinn, Estonia, November 18-22, 2015
Warsaw Cup Warsaw, Poland, November 26-29, 2015
Denkova-Stavinski Cup Sofia, Bulgaria, December 2-6, 2015
Golden Spin of Zagreb Zagreb, Croatia, December 9-12, 2015
But first Grand Prix 2015/16 - Skate America starts 22nd of October. Other Grand Prix every next week.
Calendar of all competitions in 2015/16:
http://static.isu.org/media/201261/1940-fs-intl-comps-2015-2016.pdf