diff --git a/52.md b/52.md
index 86e88be1..9be0480c 100644
--- a/52.md
+++ b/52.md
@@ -26,13 +26,12 @@ The `.content` of these events should be a detailed description of the calendar
 
 The list of tags are as follows:
 * `d` (required) universally unique identifier (UUID). Generated by the client creating the calendar event.
-* `type` (required) type of the event, list of [_onsite_, _online_]
+* `title` (required) title of the calendar event
 * `start` (required) inclusive start date in ISO 8601 format (YYYY-MM-DD). Must be less than `end`, if it exists.
 * `end` (optional) exclusive end date in ISO 8601 format (YYYY-MM-DD). If omitted, the calendar event ends on the same date as `start`.
-* `address` (required if `type` is _onsite_) address of the calendar event following ISO 19160:2015 and splitting the elements in the array; the country is specified in ISO 3166
-* `place` (optional, permitted only if `type` is _onsite_) name of the place of the calendar event. e.g. univeristy, building, business, public space
+* `address` (optional) address of the calendar event following ISO 19160:2015 and splitting the elements in the array; the country is specified in ISO 3166
+* `place` (optional) name of the place of the calendar event. e.g. university, building, business, public space
 * `g` (optional) [geohash](https://en.wikipedia.org/wiki/Geohash) to associate calendar event with a searchable physical location
-* `url` (required if `type` is _online_) the url where the user can access the calendar event; it can be a nostr:naddr1xxx or a http(s)://xxx endpoint
 * `languages` (optional) list
   of [IETF language tags](https://en.wikipedia.org/wiki/IETF_language_tag) indicating the major languages used in the event
 * `p` (optional, repeated) 32-bytes hex pubkey of a participant, optional recommended relay URL, and participant's role in the meeting
@@ -52,8 +51,6 @@ The following tags are deprecated:
   "tags": [
     ["d", "<UUID>"],
 
-    ["type", "<onsite>", "<online>"],
-
     ["title", "<title of calendar event>"],
 
     // Dates
@@ -102,10 +99,10 @@ The list of tags are as follows:
 * `end` (optional) exclusive end Unix timestamp in seconds. If omitted, the calendar event ends instantaneously.
 * `start_tzid` (optional) time zone of the start timestamp, as defined by the IANA Time Zone Database. e.g., `America/Costa_Rica`
 * `end_tzid` (optional) time zone of the end timestamp, as defined by the IANA Time Zone Database. e.g., `America/Costa_Rica`. If omitted and `start_tzid` is provided, the time zone of the end timestamp is the same as the start timestamp.
-* `address` (required if `type` is _onsite_) address of the calendar event following ISO 19160:2015 and splitting the elements in the array; the country is specified in ISO 3166
-* `place` (optional, permitted only if `type` is _onsite_) name of the place of the calendar event. e.g. univeristy, building, business, public space
+* `address` (recommended if `type` is _onsite_) address of the calendar event following ISO 19160:2015 and splitting the elements in the array; the country is specified in ISO 3166
+* `place` (recommended if `type` is _onsite_) name of the place of the calendar event. e.g. university, building, business, public space
 * `g` (optional) [geohash](https://en.wikipedia.org/wiki/Geohash) to associate calendar event with a searchable physical location
-* `url` (required if `type` is _online_) the url where the user can access the calendar event; it can be a nostr:naddr1xxx (preferably a NIP-53 event) or an http(s)://xxx endpoint
+* `url` (recommended if `type` is _online_) the url where the user can access the calendar event; it can be a nostr:naddr1xxx (preferably a NIP-53 event) or an http(s)://xxx endpoint
 * `languages` (optional) list
   of [IETF language tags](https://en.wikipedia.org/wiki/IETF_language_tag) indicating the major languages used in the event
 * `p` (optional, repeated) 32-bytes hex pubkey of a participant, optional recommended relay URL, and participant's role in the meeting