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Atlas / London Weekend / Tech Calendar Issued 29 May 2026 · No. 108

London tech & the May–June window

Every major London IT conference in late spring 2026, pinned to its weekday so the weekend reads at a glance. One event spans Saturday and Sunday. One stretch of five weekdays sucks everything else into its orbit. The rest is fringe and decision.

1
Weekend-spanning anchor · PyData, Jun 5–7
12
Day window from Africa Tech Summit to LTW Fringe close
10
Flagship paid conferences inside the window
£149–£2,699
AI Summit pass range
If you want…
a working weekend inside the topic
PyData London
Fri–Sun · Jun 5–7 · Convene Sancroft, St Paul's · paid [1]
If you want…
tech-buzz weekends without a badge
Bookend Tech Week
Jun 6–7 IN or Jun 13–14 OUT · ride the free fringe Mon–Fri [15]
If you'd rather…
skip June entirely
Wait for autumn
Big Data LDN Sep 23–24 (free) or React Advanced Oct 23 & 26 [10]
Legend Weekend anchor (PyData) Tech Week core (LTW, AI Summit) Security & infrastructure Engineering leadership Hardware / IoT Free / fringe / hackathon Past · skip Tech Week band Jun 8–12 Weekend lane
§ I · The chronogram 5 weeks · 7 columns · 1 weekend anchor

May 25 → June 28, 2026 — every flagship event pinned to its weekday.

Week
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Wk 22 May 25 – 31
25
26
27
28
29
30
31
⚠ DevOpsCon London (May 11–15) — past Next edition same window May 2027 [9]
Africa Tech Summit London Stock Exchange · 10th ed. [8][22]
Open weekend Last quiet Sat–Sun before the cluster
Wk 23 Jun 1 – 7
1
2
3
4
5
6
7
AI Native DevCon The Brewery, Barbican · agents in prod [13]
LDX3 LeadDev InterContinental – The O2 · 2,500+ leaders [3]
Infosecurity Europe ExCeL London · 09:30–17:30 (Thu close 16:00) [4][5]
PyData London 2026 ★ anchor Convene Sancroft, EC4M · tutorials Fri, talks Sat–Sun [1]
Wk 24 Jun 8 – 14 ▸ TECH WEEK
8
9
10
11
12
13
14
London Tech Week — main expo Olympia London · MS & AWS headline partners [2][21]
AI Summit London Tobacco Dock · £149–£2,699 · 5,000+ [6][7]
Hardware Pioneers Max ExCeL London · 250+ exhibitors, 6,000 engineers [12]
LTW Hackathon ICC · 1-day sprint · free entry [14]
LTW Fringe — drinks, pitches, roundtables across the city Mostly free · the cheapest way into the buzz [15]
Post-cluster tail Quiet Sat–Sun · dinner-and-drinks recovery weekend
Wk 25 Jun 15 – 21
15
16
17
18
19
20
21
No flagship IT conferences in window Drop into a weeknight meetup (see § II below) — or read the sibling page on things to do
Wk 26 Jun 22 – 28
22
23
24
25
26
27
28
Quiet — the calendar resets until autumn Next majors: Big Data LDN (Sep 23–24), React Advanced (Oct 23 & 26) — see § IV
§ I.a · Stack day · Wed Jun 10

Four flagships, three venues, one Wednesday.

The single densest day of the cluster. LTW's expo closes the same day the AI Summit and Hardware Pioneers open; the LTW Hackathon runs in parallel at the ICC. Pick one venue and commit — Olympia (W14), Tobacco Dock (Wapping) and ExCeL (Royal Docks) are 45+ minutes apart by Elizabeth line.

London Tech Week — expo close
Olympia London · W14
Paid · Day 3 of 3
AI Summit London — Day 1
Tobacco Dock · Wapping
£149–£2,699
Hardware Pioneers Max — Day 1
ExCeL London · Royal Docks
250+ exhibitors
LTW Hackathon
ICC at ExCeL · 1-day sprint
Free · selection
§ II · Recurring meetups Weeknight options for any London weekend

If the weekend stretches into Monday or starts Thursday.

4th Wed monthly · ex-Dec

London Node.js User Group

Backend JS, same monthly cadence since September 2011 — longest-running on the list [16].

MTWTFSS
Monthly · weeknight

London.js

JS / React / frontend tooling — absorbed the dormant React London User Group [17].

MTWTFSS
Monthly · ~3hr demo night

AI Tinkerers London

Working AI prototypes, not sales decks — members from OpenAI, Google, Meta, Anthropic, Vercel [18].

MTWTFSS
Fortnightly Tue · online

Silicon Roundabout

Deep-tech founders and investors. Main format is now online, so a London weekend doesn't unlock anything you couldn't join remotely [19].

MTWTFSS
§ III · Autumn & winter anchors For trips that skip the June crush

Sep · Oct · Dec — four anchor events between the next two weekends worth a flight.

2026 H2 calendar strip dev.events tracks 62+ London IT confs for 2026 [20]
SEP 2026
23 – 24 · Wed–Thu
Big Data LDN Free
Olympia London · 15 conf theatres · Snowflake/Databricks/Google Cloud [10][23]
OCT 2026
23 & 26 · Fri (in-person) + Mon (online)
React Advanced London Hybrid
The Brewery, EC1Y · Sat Oct 24 stays free for the Michelin table [11]
DEC 2026
3 – 4 · Thu–Fri
The Principal Dev — Masterclass for Tech Leads
London (TBC) · niche tech-lead workshop format [20]
10 – 11 · Thu–Fri
Clean Architecture Masterclass
London (TBC) · Java-flavoured architecture deep-dive [20]
§ IV · The three you'd pin to the corkboard Headliners by cluster
PyData London
JUN 5–7 · Convene Sancroft, EC4M
★ ONLY WEEKEND ANCHOR
London Tech Week
JUN 8–12 · Olympia + city-wide fringe
★ CLUSTER GRAVITY
Big Data LDN
SEP 23–24 · Olympia London
★ FREE AUTUMN PIVOT
§ V · Heuristics for picking Four rules surfaced by the calendar

The rules the grid makes obvious.

i.
Weekend overlap beats prestige.
PyData (Sat–Sun) beats London Tech Week (Mon–Fri) on this single axis, even though LTW is ~10× larger [1][2].
ii.
Free fringe > paid expo.
If you don't need badges or 1:1 meetings, the LTW fringe is the cheapest way to brush against the Microsoft / AWS / Anthropic crowd [15][21].
iii.
Bookend the dinner.
A Saturday Michelin booking pairs cleanly with PyData Saturday afternoon (Convene Sancroft is EC4M, walkable to most central restaurants) or a Sunday brunch + Big Data LDN Monday opener.
iv.
Venue distance is real.
ExCeL (Hardware Pioneers, Infosecurity) is in the Royal Docks — 40–50 min on the Elizabeth line from central. Olympia (LTW expo, Big Data LDN) is W14, ~25 min. Tobacco Dock (AI Summit) is Wapping, 15–20 min. Plan the dinner table accordingly.