Link node 1 to node 2 and create list I basically have a content type of companies and another of events. I would like to have a page with a select list of all companies and a select list of all events so that the user can choose what company is attending what event. This will need to allow multiple combinations. 

Example: Company 1 will be at Event 1 and Event 2.

There will need to be list of all companies attending the selected event.
This can be done using a combination of Editable Views and Entity Reference. 

You will need to create an entity reference field on one of the content types that points to the other. Then create a view of that content type.

Using editable views you can have a select list to add an entity reference on the company node to the event node. If you set up the entity reference field to allow multiple values, you will be able to have one company attending multiple events.

You can also create a view that shows all entities that reference the the event in order to show a list of all companies who will be attending an event.