diff --git a/ObsoleteFiles.inc b/ObsoleteFiles.inc
index 4c35cb7d64a4..0343fb7cb95c 100644
--- a/ObsoleteFiles.inc
+++ b/ObsoleteFiles.inc
@@ -36,6 +36,10 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20200528: libevent renamed libevent1
+OLD_FILES+=usr/include/private/event/event.h
+OLD_DIRS+=usr/include/private/event
+
 # 20200523: new clang import which bumps version from 10.0.0 to 10.0.1.s
 OLD_FILES+=usr/lib/clang/10.0.0/include/cuda_wrappers/algorithm
 OLD_FILES+=usr/lib/clang/10.0.0/include/cuda_wrappers/complex
diff --git a/etc/mtree/BSD.usr.dist b/etc/mtree/BSD.usr.dist
index f5c1cb24eba1..3c7350ea24e1 100644
--- a/etc/mtree/BSD.usr.dist
+++ b/etc/mtree/BSD.usr.dist
@@ -11,7 +11,7 @@
         private
             bsdstat
             ..
-            event
+            event1
             ..
             gmock
                 internal
diff --git a/lib/Makefile b/lib/Makefile
index 4d72fab858ad..3c29635ffda8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -48,7 +48,7 @@ SUBDIR=	${SUBDIR_BOOTSTRAP} \
 	libdwarf \
 	libedit \
 	libelftc \
-	libevent \
+	libevent1 \
 	libexecinfo \
 	libexpat \
 	libfetch \
diff --git a/lib/libevent/Makefile b/lib/libevent1/Makefile
similarity index 97%
rename from lib/libevent/Makefile
rename to lib/libevent1/Makefile
index 1618d0199ef6..8c3a9acf82a6 100644
--- a/lib/libevent/Makefile
+++ b/lib/libevent1/Makefile
@@ -5,7 +5,7 @@ PACKAGE=lib${LIB}
 
 .include <src.opts.mk>
 
-LIB=		event
+LIB=		event1
 SHLIB_MAJOR=	1
 PRIVATELIB=
 
diff --git a/lib/libevent/Makefile.depend b/lib/libevent1/Makefile.depend
similarity index 100%
rename from lib/libevent/Makefile.depend
rename to lib/libevent1/Makefile.depend
diff --git a/share/mk/src.libnames.mk b/share/mk/src.libnames.mk
index b827dafb5065..2045e5b8af6f 100644
--- a/share/mk/src.libnames.mk
+++ b/share/mk/src.libnames.mk
@@ -18,7 +18,7 @@ _PRIVATELIBS=	\
 		auditd \
 		bsdstat \
 		devdctl \
-		event \
+		event1 \
 		gmock \
 		gtest \
 		gmock_main \
diff --git a/usr.sbin/ftp-proxy/Makefile b/usr.sbin/ftp-proxy/Makefile
index 443db1c00a2d..7d05aa9bf624 100644
--- a/usr.sbin/ftp-proxy/Makefile
+++ b/usr.sbin/ftp-proxy/Makefile
@@ -9,7 +9,7 @@ SRCS=	ftp-proxy.c filter.c
 
 CFLAGS+=-I${SRCTOP}/contrib/pf/libevent
 
-LIBADD=	event
+LIBADD=	event1
 
 WARNS?=	3
 
diff --git a/usr.sbin/ypldap/Makefile b/usr.sbin/ypldap/Makefile
index 4ba12a7bbd29..7fbe945aaf5d 100644
--- a/usr.sbin/ypldap/Makefile
+++ b/usr.sbin/ypldap/Makefile
@@ -9,7 +9,7 @@ SRCS=		parse.y ypldap.c log.c	\
 
 MAN=		ypldap.8 ypldap.conf.5
 
-LIBADD=		openbsd event util rpcsvc
+LIBADD=		openbsd event1 util rpcsvc
 
 CFLAGS+=-I${.CURDIR}
 CFLAGS+=-I${SRCTOP}/contrib/pf/libevent