Update sponsorship calendar through 2027

[Copilot]

Conference/Workshop Details

• Name, Location, Date(s), Website URL and Status are required
• X / Twitter is Optional
• Location should be City + Country or Online
• Status can include information about registration, pricing, calls for proposals and can include links to all the above.

Checklist

• I have added the conference/workshop to the correct YAML file (_data/current.yml or _data/past.yml)
• The entry includes name, location, date(s), url and accurate status
• The entry is in chronological order (soonest to furtherest away)
• If there are any special characters in the name field (: or ; or '), the name must be in quotes (")
• I have checked for duplicates to avoid listing the same event twice
• Build runs successfully

Additional context

The sponsorship calendar needed to be brought current so older booked months were removed and future availability was extended for the 2027 planning horizon.

• Removed the August 2026 and earlier sponsorship rows.
• Extended the table through December 2027 and marked each remaining month as Open.
• Kept the page aligned with the current sponsor inventory and visible availability at a glance.

• Fixes Extend the sponsors table to 2027 #927