Two sub-menus pointing to the same add-on

[jsn]

Hi all

I have a multilingual web site that shows a Calendar in Spanish and English menu . My problem is that when I set up the calendar in the Spanish menu and English menu, it opens two different calendar, and I would liek to have only one.

How can I call the same Add-On form differnt sub-menus?

Also, because we are a parents association, I need to allow several users to enter events in the calendar, how can I authorize a user o group of users to do that?

I addition I need to create a Events page but witout a calendar, only listing events. It there anything for that?   similar to this page: http://www.taoist.org/content/standard.asp?name=NewsEvents

Please advice