How can you politely invite yourself to the party without seeming pushy or imposing?

One way to politely invite yourself to a party without seeming pushy or imposing is to express your interest in attending and ask if there is room for one more guest. You can also offer to bring something to contribute to the party, such as a dish or drinks. It's important to be respectful of the host's decision and understand if there may not be space for additional guests.