Why Are My Event Reminders Not Being Sent?
Is your Scheduled Jobs for Send Scheduled Reminders enabled at civicrm/admin/job?reset=1 ? If so, does the View Log Job have any info? /civicrm/admin/joblog?jid=8&amp;reset=1. 

If not, and if you want to confirm if your cron is running, then enable a Scheduled Job and then check back later, when it should have run, and see what the Scheduled Job shows as the last time it ran. If it hasn't run then you probably need to check your cron set up http://wiki.civicrm.org/confluence/display/CRMDOC/Managing+Scheduled+Jobs