How about at one or two games dedicate part of the 50/50 raffle for a nice plaque? I'm not saying the baseball team would sacrifice their half, make an announcement ahead of time letting everyone know that X amount of $ is needed to pay for the plaque and until that amount is raised the 50/50 raffle would be split 50/25/25 with 50% going to the team, 25% going to the winner & 25% going to the plaque!