Hi I have a problem I can only see events if I am as an administrator, if I enter as a visitor normal throws me a 404 error.
How I can fix this problem
What version of sNews have you installed your Calendar project in... is it a default 1.6 package, a modified one, or a default 1.7 package?
I have not experienced this in the past. I attempted to replicate your problem with sNews 1.6 without success.
Your best bet would be to go over the original installation instructions at the start of this thread again, checking your files, to make sure you have not missed anything.
Definitely be sure that you have added the hard-coded function-names - calendar,events_list,month_current_full,event_list,event_edit,event_new,event_update,event_delete,event_save
- to the $l['cat_listSEF']
string near the bottom of the language variables section in the snews.php file.