Forms :: Auto Populate Date Field During Data Entry

I have created a basic Volunteer Events and Hours Volunteered tracking database.

I created a form Volunteer Hours to allow an end user to use that form to record the volunteer and hours volunteered on a specific Event. There are two tables needed in the form Volunteer Hours to be used for the end users to record the Event, Volunteer, Date and Hours. The form has drill down fields from two tables:

Table A - Volunteer Events (event name, date, descr, owner, co-owner, loc, status)
Table B - Volunteers (name, co, div, emp#,title)

I want to be able to select the Volunteer Event and have the event date automatically populate in the Volunteer Hours form date field when the Event is selected to eliminate the end user from having to enter the date in.

Also; I would like to be able to add more than one volunteer at a time to an event on the form, this would also decrease the data entry time.

Are one or both of these things possible?