How do we organise calendars for multiple gaming campaigns which are mostly composed of the same players?

Obsidian Portal was/is thought a worthwhile alternative to try out as it is to support/become involved in a gaming site set up by gamers for gamers.

Note: The calendar entries and having multiple game masters (gms) is only available in “Ascendant” membership.

This is currently a campaign calendar test rather than a campaign. No additional players are being looked for. Sorry.