Alger Arbour & Ray Miron RIIP

The Deaths in 2015 site lists under August 27 and 28, two hockey enthusiasts, one who played for the Maple Leafs, and the other serving on the executive with the Maple  Leafs, note from their wiki pages:

• Alger Joseph "Radar" Arbour (November 1, 1932 – August 28, 2015)
• Ray Miron (March 20, 1923 – August 27, 2015) 

Their passing one day after the other generates an "August 27, 28/ Date Sequence" pattern-cluster.  
Note from Miron's wiki page:

• Miron co-founded the CHL with Bill Levins in 1992

Note from Bill Levins wiki page:

William “Bill” Levins (1922 – August 26, 1991) 

Now with Levins date of death, the cluster expands into an "August 26, 27, 28/Date Sequence" pattern-cluster.