I did one last weekend with one of my realtors and we had a great time. We used the Easter occasion to hide eggs in the house and give kids Easter baskets. We marketed the event and invited neighbors to come out.
For me open houses are ALWAYS a good idea unless you are one of those realtors who are "maxed out on success." I have only met a few of those realtors and of course I am always in awe. :)
Any time you can brand yourself in the community is always a good idea.
The good news is that serious buyers will show up to your Open House on Holidays. Easter is a family holiday and most families with children will be so busy that they will likely not be able to squeeze time for the Open House. You may want to consider selecting another weekend when you can get more traffic to your Open House. Best of luck on the sell of your home!
I would strongly suggest not doing an open house during the Easter weekend and Passover. Many people go away and in fact, the builder sites are typically all closed. next week would be a better weeK!