Best way to auto-import events into Google Calendar?

The goal: See upcoming events from various NYC venues in one place, possibly my Google Calendar

The problem: Bars and venues all use different sites and apps to manage their event calendars, forcing me to check each venue's website individually. It sucks!

My best guess at a solution: Find a way to convert the venue's websites/calendars to RSS, then use IFTTT to convert the RSS feeds to Google Calendar entries.

1. Is that the correct solution?
2. Does anyone know the best way to convert these sites to RSS?

Here are the calendars that I need to convert:

• Barbes

• Rockwood

• Union Hall

• The Skint This one actually has RSS, but it combines multiple events into each RSS entry

• Starr Bar

• Jalopy Theatre

• Art Cards

• Art Net

• NY Art World

And one newsletter:

• Nonsense NYC

These venues already use Google Calendar, so I've successfully imported them:

• House of Yes

• Union Docs

• Branded Saloon

• Sid Gold's Request Room

Thank you Software Options!