You could try crepe paper streamers taped to the ceiling, twisted and taped to the floor - like we used to do for high school proms. Tape the streamers abutting each other so it looks like a solid wall of vertical twists in your wedding colors.
I just did a wedding for my nephew at a fire hall. I took material and cut (tore) into 2 inch wide strips and tied to a clothes line ad hung those from the ceiling for a flowing wall cover. I got the material from a fill a bag fabric outlet. I got 20 pieces for $2 a bag...had enough material for table cloths also. Then I made pom poms from tulle and hung from ceiling along with tissue paper pom poms and streamers. The tables had vases filled with fake greenery painted silver. It turned out beautiful. Everybody commented how gorgeous it looked.
I agree with dusty--use sheets (you can use them later) or buy some tablecloths from the dollar store. If you can't afford that, just don't worry about it. People are coming to see the wedding and congratulate the two of you--they'll remember you and not the hall.
I decorated a hall with inexpensive fabric from the $1 bin. I was able to get black, which worked for my party, but you can do your colors. I hung it on fishing line and wrapped around the ceiling tile frame - check with the hall to see the best way for your venue. I had eight panels - just straight down, bunched a little at the top like curtains. Use as many as you can afford. Then, I cut big pieces of poster board in the shapes of stars and moons, wrapped them in foil, and pinned them to the fabric at various heights. You could do wedding bells. Add sparkle. Add a monogram - always classy. Then I did simple twinkle lights above and as boarders on tables and dimmed the bright lights - always helpful. Rave reviews! Good luck. P.S. Remember to decorate with all the senses - get scented candles if you can.
The Dollar Tree & Dollar stores offer much for decorations, packages of plates, napkins, forks, & big plastic platter dishes. Helped us so should help you.
When I got married back in the 60s my reception was in the American Legion Hall and there were no decorations, other than the table with the cake on it. The table for the bridal party had a white tablecloth and a couple tapers on it for decoration. Don't worry about hiding the flags. I'm sure most of your guests know your circumstances. That being said, why don't you just go and get married, instead of having a wedding and reception. That is what I did, our immediate families knew when we were getting married, and the reception that I mentioned was put on my in-laws, so that their relatives and friends could meet me. They also could have afforded to do more in the line of decorations, but they were frugal.
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