[lucid]

I'm fairly certain the gov't of Alberta site would have some info for students and internships.
The City of Calgary's jobs are numerous, but lots are filing/data entry, like calf said. Though in the past I have seen summer positions posted that dealt with working with aldermen and others that involved work on special projects (these vary from year to year). If I recall correctly, these job postings aren't usually published until sometime in the new year.