Using fishing lines and hooks to attach balloons can be a good solution, especially for informal events and children's parties. Line and hooks allow you to freely adjust the height and location of the balloons. You can hang balloons at different heights and create interesting arrangements.

Latex to Latex What could be more perfect than a rubber adhesive? A latex-based glue! In the U.S, Elmer's make a rubber cement that works perfectly  it dries fast and makes a strong bond.