Inverness resident Suzanne Speh once helped organize a fundraiser for the Inverness Garden Club, only to find out that the Marin Agricultural Land Trust was holding a major fundraiser on the same day. “Things like that, to me, are just a catastrophe,” she said. “It’s always been so frustrating to me that we don’t have a community planning calendar.” She’s now advocating for both a community calendar and a digital calendar for people planning visits to West Marin from afar. Community calendars exist—including in this newspaper and on the West Marin Commons website. But Ms. Speh noted that they only list events so far into the future and have limited accessibility for non-subscribers. Two workshops she will hold later this month will discuss a potential solution: a smartphone app called Cultr that her son, Chris Harmon, developed a year ago. Cultr “can contain things out into the future indefinitely,” is free and also lists nearby businesses, she wrote in an email, though she noted that she didn’t believe other calendars should disappear.  Cultr is a fairly simple event calendar app; its launch is “in the very early stages,” Mr. Harmon said in an email, but current users include “women’s tech groups in the Bay Area organizing with the app, tech groups in Toronto, Canada and North Carolina, arts communities in Austin and even veterans groups in Northern California.” When opened on a smartphone, it lists both events and places in the nearby area. Tabs at the top of the screen narrow the list to events happening “now,” “later,” this weekend or next week. More filters at the bottom let users choose a specific date or a type of event. Anyone can load events, which can be public or private. Listings include pretty much anything: gallery shows, committee meetings, board meetings, fundraisers, concerts and more. The default is to display events in the nearby area, but users can change locations if looking to plan a trip elsewhere—a feature that Ms. Speh said could help tourists figure out what to do here. Ms. Speh has already populated it with local happenings—the hope being that listing a critical mass will make the app more likely to take hold in West Marin. “I’ve been madly loading in events,” she said. For the coming weekend, current listings include Saturday morning yoga, a bird class organized by the Point Reyes National Seashore Association, Dance Church, yoga and tai chi chu’an. Right now, events go out as far as four months, but Ms. Speh hopes local groups will start listing events as far as nine or 10 months in advance. “Many people have told me they are excited about this, but I can’t stress enough that it will only be useful and successful if people participate—this means entering events you know about in the app, using it to find events you are interested in and telling your friends,” she said in a followup email.