B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
61
61 -- community participants for Madrid Challenge (2025)
The Madrid Challenge community has grown to 61 association meeting planners.
Attribution:
View source
Lighthouse Research Team
Last verified:
·
How we verify data →
Source verified
Evidence graded
Value
61
Unit
Count
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
BestCities Global Alliance
Primary
Tier A
https://bestcities.net/bestcities-commemorates-25th-anniversary-with-look-back-at-key-milestones/ ↗
Source Article
BestCities Commemorates 25th Anniversary with Look Back at Key Milestones | BestCities
BestCities Global Alliance is celebrating 25 years of championing and facilitating legacy-making business events that make the world a better place. Through groundbreaking initiatives like the Incredible Impacts Programme and the Madrid Challenge, the organisation has helped to guide the industry to…
Original Research
BestCities Global Alliance
· Original study ↗
Methodology
Company announcement, growth from initial 23 pledges in 2021
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Madrid Challenge: 61 community participants. Source: BestCities Global Alliance (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/madrid-challenge-planners-2025
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<blockquote cite="https://lighthousedata.io/data/madrid-challenge-planners-2025" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>61</strong> -- community participants for Madrid Challenge<br><small>Source: BestCities Global Alliance (2025) · <a href="https://lighthousedata.io/data/madrid-challenge-planners-2025" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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