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Before you decide on a public promposal, make sure you think carefully about the ramifications. If you think your boyfriend might be embarrassed by a public invitation, it may be best to stick to something more private. It's also important to consider the possibility that your boyfriend might say no, so a public invitation may be embarrassing for you as well. If you want to make a big display of your promposal, consider decorating something that everyone else will see, like his locker or his car. You can use sticky notes, streamers, wrapping paper, balloons, and anything else you can think of to make your message extra flashy.  Consider hiding your message inside of a balloon to keep him guessing.  If you want the message to be semi-private, you can decorate his front lawn or garage door so he will see your message as soon as he gets home (and so will all the neighbors). Get friends involved in your promposal by having them spell out a message for your boyfriend. They can each wear part of the message on their clothing, or they can carry large signs.  You can make this kind of promposal as public as you want by choosing the right location. If you just want his friends to be there, arrange it around a small get-together. If you want the whole school to see it, you can have your friends display their message in the cafeteria or at a sporting event. If your boyfriend plays a sport or is involved in a club, he might really appreciate it if you incorporated these interests into your promposal. For example, you could arrange for the members of his football team to spell out "prom?" with notes taped to their helmets, or you could ask the drama club to hold up a banner for him at the end of a performance. You can even have your friends do a performance for him, like a choreographed dance or a skit, if they're willing. If you want a truly public promposal, try to put up a giant banner or sign where everyone will see it.  If you have a large budget, you could rent space for your message on a billboard or jumbotron, or even have an airplane sky-write your message. Only use this method if you're absolutely sure that your boyfriend will not mind a grand display and you're fairly confident that he will say yes. If you're working with a limited budget, consider asking your school if you can hang a banner somewhere visible. You can also consider asking a nearby local business if you can hang your sign on their building or use their changeable sign to display your message for a few hours. If you're brave enough, you can try asking your school if you can make the daily announcements and ask your boyfriend to prom in front of the entire school. If your boyfriend is a social addict, post something on Twitter, Facebook, Instagram, or another social media site. Make sure it is appropriate, because it will be on the Internet forever. Depending on your own personal preferences, your message can be simple and to the point, or it can be more elaborate. You could, for example, consider posting a cryptic message that he needs to decode or picture of yourself holding up a sign asking him to prom.
Proceed with caution. Decorate something. Enlist the help of others. Create a public display. Make an announcement. Post it on social media.