It's probably bad form to talk about money so early on a Monday but these are strange times, so here I go with some more tips to help control your costs:
If a picture is worth a thousand words, then a look is worth a million. Do not underestimate the value of a site visit. Bring along a detailed checklist. Only a visit will tell you that a restroom or coat check needs to be installed!
What you do not ask, you will not receive. Are you renting a meeting room? Ask for office space. Spending $10,000 on individual audio-visual equipment? Ask for a bundled price. Always remember to mention repeat business or referrals you can send their way.
Having a small or short function? Have drinks charged to your master bill upon consumption, rather than an inflated open bar price. If open bar is the only way to go, make sure your final numbers include the standard 25% drop-off in attendance.