Depending on how far you are in your planning, you could do some of these things:
-Cut back on limos (or eliminate them all together), and get either a sedan service ir an hourly taxi rental. Not sure about your area, but here in DC a licensed taxi is $25 and hour, which is WAY less than a limo. It’s not as fancy but in the grand scheme of things, it might be a really easy way to save some big dollars
-Do a rehearsal luncheon instead of rehearsal dinner. Even better, do a rehearsal luncheon with only the wedding party followed by the actual rehearsal, then do a light appetizers mingling if you feel you need to have an event with all the out-of-towners
-Use potted plants as centerpeices. You can get nice pots on etsy for $10 each, even cheaper if you go to a crafts store, and a live plant in bloom doesn’t need any other dressing up
-Cut as far back on the flowers as you can bear to go. The bride’s bouquet can be almost any arrangement from a florist, just wrap it in florists’ tape or ribbon. It’s the same exact flowers as the bridal bouquet, but at 1/3 the cost. Or DIY the flowers
-VistaPrint is on Groupon pretty regularly; get your invites using a groupon
-Do your RSVP’s online; a $5/month website, offered by a lot of companies, left online for 2-3 months, will save you a whole lot of money in postage and envelopes
-You may be able to trim a bit from your catering bill, even if the contract is already signed, by arranging vendor meals for your photographer, DJ, and other staff instead of giving the same meal that the guests get. The staff often prefers a vendor meal, as it’s often a sandwich or a wrap that can be eaten quickly so they can get back to work, instead of a knife-and-fork meal that they won’t have time to properly enjoy. Also ask about kids’ meals as part of your headcounts.