Here is what I would like to accomplish:
Create an event database system whereby someone(user) can register as a host of a predefined(by the website) event type with event details, He/She (user above) would invite Guests to sign up for the event and the event registrant/host would be able to view/update/edit/delete any information about the guests that signed up for their respective events.
This is what I have so far with the design:
Tables:
Users (userID, userInfo)
Events( EventID, EventTypeID, UserID, EventDetails)
Guests (GuestID, userID, eventID, GuestDetails)
Event type( EventTypeID, userID, event types Details)

Please any suggestions would be very much appreciated!

Do you require a GuestID? Is the combination of userID and eventID unique?

Can you explain your thoughts behind the event type table?

Well, the thoughts behind the event type is something like this:
Event types: Association meetings, club event, wedding event, birthday party,family reunion, class reunion and so on. The idea is that people who want to host these events would have a way of creating one of these events on the website, and invite their guests who are interested to sign up for their specific event. The host should have a way to pull up a list of the guests and edit, delete or update the list as they wish.
I was thinking the guestID would help the host identify which guests would be coming to the event and acknowledge their interest.
Maybe I am wrong. But any suggestions would be highly appreciated.