Before you create another on-line calendar for engineers,
check the calendar on the NCSEA website. NCSEA is
looking at making this a searchable, sortable database,
where you can look for specific topics, dates or
locations. There is also at least one other organization
that has an on-line calendar. (I don't want to mention
names, but it starts with an "A", ends with "C", and has
"IS" in the middle.)
Anyone can submit events to both of these calendars.
The biggest benefit of such calendars and databases is
when they contain the most information. More calendars
could dilute the effectiveness.