I know I've seen the documentation, but cannot find it in the Help Center now.

I am trying to find some additional fields for an email I am sending through a WorkFlow.  This is my current email, but there are about 10 more fields I need to grab. Can anyone send me the link to the docs?

{organizer} has requested your approval of an event

{title}

Rooms Requested: {location}

Date: {startdate}
Start Time: {starttime}
End Time: {endtime}

Expected # of Guests: {custeventattendance}

This is the message they sent...
{custevent_brit_calmsg}