Matthew 21:8-9

Matthew 21:8-9

[8] And  a very great  multitude  spread  their  garments  in  the way;  others  cut down  branches  from  the trees,  and  strawed  them in  the way.  [9] And  the multitudes  that went before,  and  that followed,  cried,  saying,  Hosanna  to the Son  of David:  Blessed  is he that cometh  in  the name  of the Lord;  Hosanna  in  the highest. 

What is the context of Matthew 21:8-9?