Plugin for searching events by field

I’m looking for a plugin that will allow a visitor to search for an event using different fields. We have about 20 science teacher workshops each summer that I’d like our visitors to be able to search by the following fields: discipline (e.g. physics, chemistry, biology); date range; and state. Visitors should be able to be specify one field and leave the others blank, etc.

Each event will also have fields for leader, notes, etc. These fields don’t need to be searchable.

The data will all be entered by editors/admins for the site, so we don’t need a fancy front-end for entering the records.

Any suggestion as to which plugin(s) would work for this?

Thanks.