diff --git a/changelog/unreleased/pr-21349.toml b/changelog/unreleased/pr-21349.toml
new file mode 100644
index 000000000000..9434dec74f64
--- /dev/null
+++ b/changelog/unreleased/pr-21349.toml
@@ -0,0 +1,5 @@
+type = "fixed"
+message = "Fix missing Query Parameters in Event Definitions in Content Packs."
+
+issues = ["Graylog2/graylog-plugin-enterprise#9274"]
+pulls = ["21349"]
diff --git a/graylog2-server/src/main/java/org/graylog/events/contentpack/entities/AggregationEventProcessorConfigEntity.java b/graylog2-server/src/main/java/org/graylog/events/contentpack/entities/AggregationEventProcessorConfigEntity.java
index 9b212439194d..c22990d11cb1 100644
--- a/graylog2-server/src/main/java/org/graylog/events/contentpack/entities/AggregationEventProcessorConfigEntity.java
+++ b/graylog2-server/src/main/java/org/graylog/events/contentpack/entities/AggregationEventProcessorConfigEntity.java
@@ -26,6 +26,7 @@
 import org.graylog.events.processor.EventProcessorConfig;
 import org.graylog.events.processor.aggregation.AggregationConditions;
 import org.graylog.events.processor.aggregation.AggregationEventProcessorConfig;
+import org.graylog.plugins.views.search.Parameter;
 import org.graylog.plugins.views.search.searchfilters.model.UsedSearchFilter;
 import org.graylog2.contentpacks.exceptions.ContentPackException;
 import org.graylog2.contentpacks.model.entities.Entity;
@@ -40,6 +41,7 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import static org.graylog2.contentpacks.facades.StreamReferenceFacade.resolveStreamEntity;
@@ -52,6 +54,7 @@ public abstract class AggregationEventProcessorConfigEntity implements EventProc
     public static final String TYPE_NAME = "aggregation-v1";
 
     private static final String FIELD_QUERY = "query";
+    private static final String FIELD_QUERY_PARAMETERS = "query_parameters";
     private static final String FIELD_FILTERS = "filters";
     private static final String FIELD_STREAMS = "streams";
     private static final String FIELD_STREAM_CATEGORIES = "stream_categories";
@@ -68,6 +71,10 @@ public abstract class AggregationEventProcessorConfigEntity implements EventProc
     @JsonProperty(FIELD_QUERY)
     public abstract ValueReference query();
 
+    @Nullable
+    @JsonProperty(FIELD_QUERY_PARAMETERS)
+    public abstract ImmutableSet<Parameter> queryParameters();
+
     @JsonProperty(FIELD_FILTERS)
     public abstract List<UsedSearchFilter> filters();
 
@@ -126,6 +133,9 @@ public static Builder create() {
         @JsonProperty(FIELD_QUERY)
         public abstract Builder query(ValueReference query);
 
+        @JsonProperty(FIELD_QUERY_PARAMETERS)
+        public abstract Builder queryParameters(Set<Parameter> queryParameters);
+
         @JsonProperty
         public abstract Builder filters(List<UsedSearchFilter> filters);
 
@@ -186,6 +196,7 @@ public EventProcessorConfig toNativeEntity(Map<String, ValueReference> parameter
         return AggregationEventProcessorConfig.builder()
                 .type(type())
                 .query(query().asString(parameters))
+                .queryParameters(queryParameters())
                 .streams(streamSet)
                 .filters(filters().stream().map(filter -> filter.toNativeEntity(parameters, nativeEntities)).toList())
                 .groupBy(groupBy())
diff --git a/graylog2-server/src/main/java/org/graylog/events/processor/aggregation/AggregationEventProcessorConfig.java b/graylog2-server/src/main/java/org/graylog/events/processor/aggregation/AggregationEventProcessorConfig.java
index d497e7377b3d..ae9db56b6f7e 100644
--- a/graylog2-server/src/main/java/org/graylog/events/processor/aggregation/AggregationEventProcessorConfig.java
+++ b/graylog2-server/src/main/java/org/graylog/events/processor/aggregation/AggregationEventProcessorConfig.java
@@ -86,6 +86,7 @@ public abstract class AggregationEventProcessorConfig implements EventProcessorC
     @JsonProperty(FIELD_QUERY)
     public abstract String query();
 
+    @Nullable
     @JsonProperty(FIELD_QUERY_PARAMETERS)
     public abstract ImmutableSet<Parameter> queryParameters();
 
@@ -332,6 +333,7 @@ public EventProcessorConfigEntity toContentPackEntity(EntityDescriptorIds entity
         return AggregationEventProcessorConfigEntity.builder()
                 .type(type())
                 .query(ValueReference.of(query()))
+                .queryParameters(queryParameters())
                 .filters(filters().stream().map(filter -> filter.toContentPackEntity(entityDescriptorIds)).toList())
                 .streams(streamRefs)
                 .streamCategories(streamCategories())
@@ -356,6 +358,10 @@ public void resolveNativeEntity(EntityDescriptor entityDescriptor, MutableGraph<
                     .build();
             mutableGraph.putEdge(entityDescriptor, depStream);
         });
+        // attribute is tagged @Nullable, so do a null check first
+        if(queryParameters() != null) {
+            queryParameters().forEach(parameter -> parameter.resolveNativeEntity(entityDescriptor, mutableGraph));
+        }
         filters().forEach(filter -> filter.resolveNativeEntity(entityDescriptor, mutableGraph));
     }
 
diff --git a/graylog2-server/src/main/java/org/graylog/plugins/views/search/Parameter.java b/graylog2-server/src/main/java/org/graylog/plugins/views/search/Parameter.java
index a847b6bcc5a8..9fc859da9e0c 100644
--- a/graylog2-server/src/main/java/org/graylog/plugins/views/search/Parameter.java
+++ b/graylog2-server/src/main/java/org/graylog/plugins/views/search/Parameter.java
@@ -21,6 +21,8 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import com.google.common.collect.Maps;
+import org.graylog2.contentpacks.ContentPackable;
+import org.graylog2.contentpacks.EntityDescriptorIds;
 
 import javax.annotation.Nullable;
 import java.util.Map;
@@ -41,7 +43,7 @@
         property = Parameter.TYPE_FIELD,
         visible = true,
         defaultImpl = ValueParameter.class)
-public interface Parameter {
+public interface Parameter extends ContentPackable<Parameter> {
     String TYPE_FIELD = "type";
 
     @JsonProperty(TYPE_FIELD)
@@ -74,6 +76,10 @@ public interface Parameter {
 
     Parameter applyBindings(Map<String,  Parameter.Binding> bindings);
 
+    default Parameter toContentPackEntity(EntityDescriptorIds entityDescriptorIds) {
+        return this;
+    }
+
     interface Builder<SELF> {
         @JsonProperty(TYPE_FIELD)
         SELF type(String type);
diff --git a/graylog2-server/src/main/java/org/graylog2/contentpacks/facades/LookupTableFacade.java b/graylog2-server/src/main/java/org/graylog2/contentpacks/facades/LookupTableFacade.java
index b600bf655a26..42dd5a84f82b 100644
--- a/graylog2-server/src/main/java/org/graylog2/contentpacks/facades/LookupTableFacade.java
+++ b/graylog2-server/src/main/java/org/graylog2/contentpacks/facades/LookupTableFacade.java
@@ -76,6 +76,7 @@ private EntityDescriptor cacheDescriptor(String cacheId) {
     @VisibleForTesting
     Entity exportNativeEntity(LookupTableDto lookupTableDto, EntityDescriptorIds entityDescriptorIds) {
         final String tableId = entityDescriptorIds.get(EntityDescriptor.create(lookupTableDto.id(), ModelTypes.LOOKUP_TABLE_V1))
+                .or(() -> entityDescriptorIds.get(EntityDescriptor.create(lookupTableDto.name(), ModelTypes.LOOKUP_TABLE_V1)))
                 .orElseThrow(() -> new ContentPackException("Couldn't find lookup table entity " + lookupTableDto.id()));
         final String cacheId = entityDescriptorIds.get(cacheDescriptor(lookupTableDto.cacheId()))
                 .orElseThrow(() -> new ContentPackException("Couldn't find lookup cache entity " + lookupTableDto.cacheId()));