Grand Rapids has numerous community calendars:

Online

• Experience Grand Rapids - Searchable database of community events happening all over the city
• Grand Rapids Kids - Community calendar of family friendly events in Grand Rapids
• City of Grand Rapids - City-managed event database
• GR Now - Every possible mainstream event, kind of overwhelming, anyone can submit 
• The Rapidian [link] - General event listing, anyone can add an event
• Revue Magazine [link] - Monthly bar / music events calendar, compliment to their print magazine, anyone can submit an event
• RADiCAL [link] - DIY / art events, anyone can add an event, developed by G-RAD
• CONGA [link] - Calendar of every possible tech event in the greater Grand Rapids area
• GR Screamer [link] - Hardcore / punk music shows
•  Events in Grand Rapids, MI -  Up to date listing of local events occurring in Grand Rapids, MI
• BandGrab [link] - Searches other Grand Rapids venues for shows
• Grand Rapids Activist Calendar - defunct calendar of activist / social justice events

In Print

• Revue Magazine - Monthly features on arts and culture
• Recoil - Grand Rapids' own alt monthly / satire newspaper
• On-the-Town - Long standing arts and culture feature paper

On Viget

• Local Foods Calendar - rough schedule of when fruits and vegetables are available locally

Broadcast

• 88.1 FM WYCE Radio - Arts and Events Calendars - nonprofit listings aired Monday through Saturday at 7:30am, 10:30am, 1:30pm, 4:30pm, and 6:30pm