I'll be in town for Easter weekend, and I know that getting a ticket will be next to impossible. I will stand/lean if it is allowed in the concourse or in left field. It's been 10 years since I attended a baseball game at Olsen Field.
Yes. Although they do have a capacity where they won't sell any more tickets to enter. They sold tickets where they told you at purchase that you may be on a hill or standing behind it or at a railing until they wouldn't sell anymore to even enter the park.
In general this is true, however it will be LSU coming to Olsen that weekend. If the season is progressing how we hope it will, I expect a full house despite it being Easter weekend. Note: it will be a Thru-Fri-Sat series.