diff --git a/data/23/events/ethprague/index.toml b/data/23/events/ethprague/index.toml
index 53a962a..79a9b2f 100644
--- a/data/23/events/ethprague/index.toml
+++ b/data/23/events/ethprague/index.toml
@@ -15,7 +15,6 @@ attendees = 600
 chains = ["ethereum"]
 difficulty = "All Welcome"
 tags = ["solarpunk"]
-union = "gm-events"
 logo = "logo.jpg"
 description = """
 """
diff --git a/data/23/events/praguedefi/index.toml b/data/23/events/praguedefi/index.toml
index 3b92415..3157ed0 100644
--- a/data/23/events/praguedefi/index.toml
+++ b/data/23/events/praguedefi/index.toml
@@ -14,7 +14,6 @@ languages = ["english"]
 attendees = 1000
 #tags = []
 logo = "logo.jpg"
-union = 'gm-events'
 
 [links]
 web = "https://praguedefisummit.com/"
diff --git a/data/23/events/privacyeth/index.toml b/data/23/events/privacyeth/index.toml
index f1718fe..99d2467 100644
--- a/data/23/events/privacyeth/index.toml
+++ b/data/23/events/privacyeth/index.toml
@@ -13,7 +13,6 @@ venueUrl = "https://goo.gl/maps/xpzw6siQFXsJrrWh6"
 languages = ["english"]
 attendees = 300
 tags = ["lunarpunk", "privacy", "security"]
-union = "gm-events"
 logo = "logo.jpg"
 
 [links]
diff --git a/data/23/events/utxo/index.toml b/data/23/events/utxo/index.toml
index eec93f2..da861a1 100644
--- a/data/23/events/utxo/index.toml
+++ b/data/23/events/utxo/index.toml
@@ -14,7 +14,6 @@ languages = ["czech", "slovak"]
 attendees = 1200
 #tags = []
 logo = "logo.jpg"
-union = 'decentralizuj-se'
 
 [links]
 web = "https://utxo.cz/"
diff --git a/data/23/unions/decentralizuj-se/index.toml b/data/23/unions/decentralizuj-se/index.toml
index a570662..b1ce859 100644
--- a/data/23/unions/decentralizuj-se/index.toml
+++ b/data/23/unions/decentralizuj-se/index.toml
@@ -1,6 +1,7 @@
 name = "Decentralizuj se!"
 org = "[UTXO Foundation](https://utxo.foundation/)"
 description = "Crypto for beginners and users in local language"
+events = [ "utxo" ]
 
 [links]
 web = "https://utxo.events/"
\ No newline at end of file
diff --git a/data/23/unions/gm-events/index.toml b/data/23/unions/gm-events/index.toml
index 19a850e..aff6ec0 100644
--- a/data/23/unions/gm-events/index.toml
+++ b/data/23/unions/gm-events/index.toml
@@ -1,6 +1,7 @@
 name = "GM Events"
 org = "[PWN](https://pwn.finance/)"
 description = "The best Ethereum, Web3 and DeFi events"
+events = [ "ethprague", "praguedefi", "privacyeth" ]
 
 [links]
 web = "https://gm.events/"
\ No newline at end of file
diff --git a/utils/schema/1/event.yaml b/utils/schema/1/event.yaml
index 6b947b8..c340f9c 100644
--- a/utils/schema/1/event.yaml
+++ b/utils/schema/1/event.yaml
@@ -94,9 +94,6 @@ properties:
     type: array
     items:
       type: string
-  union:
-    type: string
-    pattern: "^[a-z0-9-]+$"      
   logomark:
     type: string
   logo:
diff --git a/utils/schema/1/union.yaml b/utils/schema/1/union.yaml
index 79a16ed..b0f31f3 100644
--- a/utils/schema/1/union.yaml
+++ b/utils/schema/1/union.yaml
@@ -18,6 +18,11 @@ properties:
   description:
     type: string
     __markdown: true
+  events:
+    type: array
+    items:
+      type: string
+      pattern: "^[a-z0-9-]+$"
   links:
     type: object
     additionalProperties: