Add template for organizing gatherings

This is a first pass at a comprehensive checklist for organizing a gathering. We can iterate as needed.

Author: ElizabethN

.github/ISSUE_TEMPLATE/gathering-checklist.md

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+---
+name: Gathering Checklist
+about: This is the checklist for planning a Gathering.
+title: Gathering Planning - [CITY], [DATE]
+labels: events
+assignees: ''
+
+---
+
+# Gathering - [CITY] - [DATE]
+
+## Event Details
+
+**📆 Date: 
+🗺 Venue Address:
+👯 Organizing Team:**
+ - InnerSourcerer 1
+ - InnerSourcerer 2 
+ - InnerSourcerer 3
+
+## Community Organizers' Checklist
+
+👉 **Start here:** [Gathering Guide for Organizers](https://github.com/InnerSourceCommons/foundation-governance/blob/master/how-to/gathering-organizers-guide.md#about-sponsorship)
+
+### 8-24 weeks before	the event	
+ - [ ] Determine the day and time
+ - [ ] Secure the event space with the venue
+ - [ ] Notify @OliveCannon the event has been confirmed
+ - [ ] "Call for Sponsorship" documentation prep
+ - [ ] Start looking for sponsors
+ - [ ] (Optional) CFP form preparation
+ - [ ] Launch early bird registration through EventBrite
+
+### 7 weeks before
+- [ ] Finalize speaker lineup
+- [ ] Work with Marketing Team on translating social media posts (If needed)
+- [ ] Confirm major sponsors
+- [ ] Update EventBrite registration page with speaker/schedule information
+
+### 6 weeks before
+- [ ] Confirm catering choices with the venue / nearby providers (Make sure to provide options for those with dietary restrictions)
+
+### 5 weeks before
+- [ ]	Finalize event format
+
+### 3 weeks before	
+- [ ] Send reminder to registered attendees
+- [ ] Confirm technical requirement
+- [ ] Food and beverages and quantities finalization 
+- [ ] Finalize all logistics
+- [ ] Brief all staff and volunteers
+
+### 2 weeks before	
+- [ ] Final venue walkthrough
+- [ ] Final registration push
+
+### 1 week before	
+- [ ] Final speaker check-in
+- [ ] Prepare all materials	
+- [ ] Final attendee communications
+- [ ] Prepare emergency procedures
+
+### Day of Event
+
+- [ ] Execute according to plan
+- [ ] Document the event
+- [ ] Enjoy!
+
+### 1-2 weeks after	
+- [ ] Send a "thank you" email to sponsors
+- [ ] Create and share a [brief report](https://gatherings.innersourcecommons.org/reports/)
+
+
+## Marketing Team Checklist
+
+### Upon confirmation of Date, Time, and Venue
+- [ ] Create page on the Gathering Website (@OliveCannon)
+- [ ] Event Promotion: Newsletter (@ElizabethN)
+- [ ] Event Promotion: Socials (@OliveCannon)
+- [ ] Create Slide for the Gathering (@OliveCannon)
+
+### 3-4 weeks before the event
+- [ ] Send box of stickers, etc to organizer
+- [ ] Continue Event Promotion (@OliveCannon)
+
+### After the Event
+- [ ] Move event to "Past Events" on the Gathering Website
+- [ ] Promote Report on socials (@ElizabethN)