Here are some resources for community events and local hotspots:

Rochester tourism website's Calender of Events:
http://rahrahrochester.com/calendar.asp

RochesterMN website's Calendar of Events:
http://www.rochestermn.com/do/calenda...

Ongoing family-oriented attractions (with descriptions!):
http://www.rochesterfamilies.com/roch...

Local ongoing attractions:
http://www.rochestercvb.org/visitors/...

A comprehensive dining guide:
http://www.rochestercvb.org/visitors/...

Nightlife (mainly bars):
http://www.rochestercvb.org/visitors/...

Performing arts:
http://www.rochestercvb.org/visitors/...

Shopping centers:
http://www.rochestercvb.org/visitors/...

Sport and recreation:
http://www.rochestermn.com/recreation...

Slightly satirical, yet exhaustive list of things to do in Rochester:
http://www.geocities.com/the_croch/to...
(Note: not completely up to date)