Track multiple submission cycles per conference

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

site/content/cloud-edge/venues/conferences/ATC/_index.md

@@ -9,7 +9,6 @@ type: conference
 icore_rank: C
 dblp_key: conf/usenix
 draft: false
-deadline_source: wikicfp:192652
 homepage: https://sigops.org/s/conferences/atc/2026/
 next_deadline: Jun 10, 2026
 next_event: Nov 16-18, 2026
@@ -38,7 +37,6 @@ cfp_url: https://sigops.org/s/conferences/atc/2026/cfp.html
 | **Event dates** | Nov 16-18, 2026 |
 | **Location** | Hong Kong |
 | **CFP** | [https://sigops.org/s/conferences/atc/2026/cfp.html](https://sigops.org/s/conferences/atc/2026/cfp.html) |
-| **Source** | `wikicfp:192652` |
 
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