Commentators

The role of the Commentator is to welcome the assembly and read the Prayers of the Faithful.  The commentator collects name(s) of presider(s), altar servers, and lectors to include in the welcome to the assembly and also reads the Prayers of the Faithful.

Lectors

There are two lectors during Mass.  Both lectors process in and out at the beginning and end of mass, respectively.  
Lector 1:  Processes in, proclaims the first reading and processess out after Mass.  
Lector 2:  Processes in, proclaims the second reading and processes out after Mass.