The tourist office in Ubud is an excellent source of information on cultural events. Otherwise the tourist offices in Bali are not useful.
Some of the best information is found in the many free publications and websites aimed at tourists and expats. There are also numerous Facebook groups, although some are simply forums for the intolerant.
Bali Advertiser (www.baliadvertiser.biz) Has excellent columns with info for visitors including 'Greenspeak' by journalist Cat Wheeler and 'Bali Explorer' by legendary travel writer Bill Dalton.
Bali Discovery (www.balidiscovery.com) The weekly online news report by Jack Daniels is a must-read of events in Bali.
The Beat Bali (http://thebeatbali.com) Useful website and biweekly publication with extensive entertainment and cultural listings.
The Yak (www.theyakmag.com) Glossy, cheeky mag celebrating the expat swells of Seminyak and Ubud.
Ubud Now and Then (http://ubudnowandthen.com) Run by famous photographer Rio Helmi and other luminaries; has Ubud-centric info and features as well as excellent Bali-wide cultural listings.