Surface stale deadlines instead of showing them as upcoming

The calendar's deadline table rendered every recorded submission cycle, so
elapsed rounds sorted to the top and read as the next thing due — 13 of its 17
rows were already in the past. Underneath that, the fetcher preserves
`source: manual` entries forever without ever checking whether they still
describe a future deadline, and 11 of 13 cloud-edge venues are manual.

Preserving them is correct: WikiCFP cannot express multi-cycle venues and does
not carry most systems conferences at all, so re-fetching would replace
researched rounds with worse data or nothing. What was missing is a signal.

- Extract the cycle helpers into cycles.py so the fetcher and the generator
  share one definition of which round a reader should act on. cycles_of()
  reads an entry without folding flat fields into a cycles list, which would
  otherwise rewrite every single-round entry the fetcher writes back.
- The calendar table lists open cycles only; a venue whose every round has
  elapsed moves to an "Awaiting the next call" table instead of vanishing.
- pa-fetch-deadlines records those venues under a new stale: key and probes
  the year-bumped CFP URL to say which ones already have a next edition
  online. A candidate must return 200, mention the target year, and be newer
  than any year the entry records — venues.yaml still points SC at sc24.
- README: Task 7 and a matching agent prompt for keeping deadlines current,
  since nothing in this repo refreshes them on its own.

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

site/content/cloud-edge/calendar/_index.md

@@ -1,7 +1,7 @@
 ---
 title: Submission Deadlines
 layout: calendar
-generated: '2026-08-17T18:20:48Z'
+generated: '2026-08-17T20:24:13Z'
 draft: false
 events:
 - title: OSDI — abstract deadline
@@ -587,24 +587,27 @@ events:
 
 | Venue | Name | Cycle | Abstract | Paper deadline | Notification | Event dates | Location | ICORE |
 |---|---|---|---|---|---|---|---|---|
-| [MobiSys](/cloud-edge/venues/conferences/mobisys/) | ACM International Conference on Mobile Systems, Applications, and Services | — | Nov 28, 2025 | Dec 5, 2025 | Mar 2, 2026 | Jun 22-24, 2026 | Cambridge, UK | A |
-| [Middleware](/cloud-edge/venues/conferences/middleware/) | ACM/IFIP/USENIX Middleware Conference | Winter | Dec 9, 2025 | Dec 12, 2025 | Mar 6, 2026 | Dec 14-18, 2026 | Tarragona, Spain | A |
-| [CCGrid](/cloud-edge/venues/conferences/ccgrid/) | IEEE/ACM International Symposium on Cluster, Cloud and Internet Computing | — |  | Dec 21, 2025 | Feb 10, 2026 | May 18-21, 2026 | Sydney, Australia | B |
-| [HPDC](/cloud-edge/venues/conferences/hpdc/) | IEEE International Symposium on High Performance Distributed Computing | — | Jan 29, 2026 | Feb 5, 2026 | Mar 31, 2026 | Jul 13, 2026 - Jul 16, 2026 | Cleveland, OH, USA | A |
-| [SoCC](/cloud-edge/venues/conferences/socc/) | ACM Symposium on Cloud Computing | Round 1 | Feb 6, 2026 | Feb 13, 2026 | Apr 29, 2026 | Nov 18-20, 2026 | Singapore | — |
-| [SOSP](/cloud-edge/venues/conferences/sosp/) | ACM Symposium on Operating Systems Principles | — | Mar 26, 2026 | Apr 1, 2026 | Jul 3, 2026 | Sep 29, 2026 - Oct 2, 2026 | Prague, Czechia | A* |
-| [SC](/cloud-edge/venues/conferences/sc/) | International Conference for High Performance Computing, Networking, Storage and Analysis | — | Apr 1, 2026 | Apr 8, 2026 | Jul 1, 2026 | Nov 15-20, 2026 | Chicago, IL, USA | A |
-| [NSDI](/cloud-edge/venues/conferences/nsdi/) | USENIX Symposium on Networked Systems Design and Implementation | Spring | Apr 16, 2026 | Apr 23, 2026 | Jul 23, 2026 | May 11-13, 2027 | Providence, RI, USA | National: USA |
-| [SEC](/cloud-edge/venues/conferences/sec/) | IEEE/ACM Symposium on Edge Computing | — |  | May 8, 2026 | Jul 29, 2026 | Oct 13-16, 2026 |  | unranked |
-| [EuroSys](/cloud-edge/venues/conferences/eurosys/) | European Conference on Computer Systems | Spring | May 7, 2026 | May 14, 2026 | Aug 21, 2026 | Apr 19-23, 2027 | Rabat, Morocco | A |
-| [Middleware](/cloud-edge/venues/conferences/middleware/) | ACM/IFIP/USENIX Middleware Conference | Summer | May 29, 2026 | Jun 5, 2026 | Aug 28, 2026 | Dec 14-18, 2026 | Tarragona, Spain | A |
-| [ATC](/cloud-edge/venues/conferences/atc/) | ACM SIGOPS Annual Technical Conference | — |  | Jun 10, 2026 | Sep 18, 2026 | Nov 16-18, 2026 | Hong Kong | C |
-| [SoCC](/cloud-edge/venues/conferences/socc/) | ACM Symposium on Cloud Computing | Round 2 | Jul 7, 2026 | Jul 14, 2026 | Sep 26, 2026 | Nov 18-20, 2026 | Singapore | — |
 | [NSDI](/cloud-edge/venues/conferences/nsdi/) | USENIX Symposium on Networked Systems Design and Implementation | Fall | Sep 10, 2026 | Sep 17, 2026 | Dec 8, 2026 | May 11-13, 2027 | Providence, RI, USA | National: USA |
 | [EuroSys](/cloud-edge/venues/conferences/eurosys/) | European Conference on Computer Systems | Fall | Sep 17, 2026 | Sep 24, 2026 | Jan 29, 2027 | Apr 19-23, 2027 | Rabat, Morocco | A |
 | [IPDPS](/cloud-edge/venues/conferences/ipdps/) | IEEE International Parallel and Distributed Processing Symposium | — | Oct 1, 2026 | Oct 8, 2026 | Feb 2, 2027 | Jun 1-5, 2027 | Seattle, WA, USA | A |
 | [OSDI](/cloud-edge/venues/conferences/osdi/) | USENIX Symposium on Operating Systems Design and Implementation | — | Dec 1, 2026 | Dec 8, 2026 | Mar 16, 2027 | Jul 7-9, 2027 | Baltimore, MD, USA | A* |
 
+### Awaiting the next call
+
+Tracked venues whose recorded rounds have all elapsed — the next CFP has not been published or picked up yet. Dates below are the last round that ran, kept for reference only.
+
+| Venue | Name | Last recorded deadline | Event dates | Location | ICORE |
+|---|---|---|---|---|---|
+| [MobiSys](/cloud-edge/venues/conferences/mobisys/) | ACM International Conference on Mobile Systems, Applications, and Services | Dec 5, 2025 | Jun 22-24, 2026 | Cambridge, UK | A |
+| [CCGrid](/cloud-edge/venues/conferences/ccgrid/) | IEEE/ACM International Symposium on Cluster, Cloud and Internet Computing | Dec 21, 2025 | May 18-21, 2026 | Sydney, Australia | B |
+| [HPDC](/cloud-edge/venues/conferences/hpdc/) | IEEE International Symposium on High Performance Distributed Computing | Feb 5, 2026 | Jul 13, 2026 - Jul 16, 2026 | Cleveland, OH, USA | A |
+| [SOSP](/cloud-edge/venues/conferences/sosp/) | ACM Symposium on Operating Systems Principles | Apr 1, 2026 | Sep 29, 2026 - Oct 2, 2026 | Prague, Czechia | A* |
+| [SC](/cloud-edge/venues/conferences/sc/) | International Conference for High Performance Computing, Networking, Storage and Analysis | Apr 8, 2026 | Nov 15-20, 2026 | Chicago, IL, USA | A |
+| [SEC](/cloud-edge/venues/conferences/sec/) | IEEE/ACM Symposium on Edge Computing | May 8, 2026 | Oct 13-16, 2026 |  | unranked |
+| [Middleware](/cloud-edge/venues/conferences/middleware/) | ACM/IFIP/USENIX Middleware Conference | Jun 5, 2026 | Dec 14-18, 2026 | Tarragona, Spain | A |
+| [ATC](/cloud-edge/venues/conferences/atc/) | ACM SIGOPS Annual Technical Conference | Jun 10, 2026 | Nov 16-18, 2026 | Hong Kong | C |
+| [SoCC](/cloud-edge/venues/conferences/socc/) | ACM Symposium on Cloud Computing | Jul 14, 2026 | Nov 18-20, 2026 | Singapore | — |
+
 ## Journal Special Issues
 
 No open call at any tracked journal. These journals use rolling submission, so special issue CFPs are their only dated deadlines — and none are recorded right now.