I've been to the last two in my area (my first two) and they are enjoyable events.
Food pretty good, get to meet some folks and rub elbows with folks you haven't seen in a while, etc.
I'd recommend visiting the web page for your local event and study it a bit.
At ours, the doors open at 5:30pm and dinner is served at 7:30pm.
Arriving at 5:30 might be a little early, but be sure you allow yourself enough time to browse the displays / stuff being auctioned, etc. well before dinner is served. Don't know how yours will be run, but at ours the folks at the outer edges of hall tables hit the buffet first. My admission ticket also allowed me two beverages of my choice (beer, soft drinks, tea).
I bought a few chances on the wall of guns - they have a wall of guns, and as soon as they sell 50 tickets, they have a drawing - winner gets his choice of firearm on the wall. They repeat until all the firearms are gone.
They have tables around the perimeter with plenty of stuff on display - some are for silent auctions, and others have buckets where you place the number of tickets you want to increase your odds of winning the item on display.
You'll probably have some of the more well heeled folks in your area going a little nuts on the auctions, so unless you're prepared to spend some money for something you just have to have...
BTW - the Dirty Harry framed picture with a few empty shell casings from his gun went for $2,500 or more - somebody really wanted that one!
Last time, when we came in the door, you pad X amount for as many tickets as you could hold in your wingspan (bring a friend with long arms) to deposit in the buckets next to items you are interested in on the display tables.
I'm halfway kicking around buying a table next year - you get tickets / meals for 8 folks, and you get a firearm for buying a table.
One of our local gun shops bought a table last year - he wanted the Daniel Defense rifle they were giving away, and he gave the 8 tickets to folks that have helped him out at his shop over the last year.
https://www.friendsofnra.org/
1. Check out the Events Merchandise link on the page above.
2. You can also check out the table packages (although since this is your first, you're probably not interested in a table?) by bringing up your local event, hit the Buy Tickets link, then check at the bottom of the page to see if they show Table Package Deals for your area.