We want to do a ride through our city to show the presence of cycling and want that people do not only see bikes, but also a message.
We thought of using some posters that we mount on our bikes, but we are not sure how to do this. We thought about glueing the posters on card board and maybe even reinforcing the card board with wood. We are thinking about A3 sized posters, or even larger. If there was somebody with experience on how to build posters so one can mount them easily on a bicycle, tips would be appreciated.
Other tips on how to convey a message as a group on bicycles would also be nice!
I wanted to keep the problem pretty open, so it can be of use to other people facing a similar problem, but since they have been requested:
Specifics are as follows: We want to make a bike ride in suits to show that cycling is possible in any attire, and I opted in to find a solution how to make posters so people see our message and do not just wonder about a group of cyclists in suits. We might need a big poster in front and in the back, and the individual cyclist should also be able to mount a message on their bikes easily (want to make around 5 smaller posters). There should be some trailers available.
It would be nice if the posters are reuseable, maybe even for different purposes, but the ride I want to use them for will only last around 2 to 3 hours.
Budget is pretty tight, I would guess around 50 $.