Are these events on the same video track? If so, try expanding the track layers [right click on track header and select expand track layers]. this will place aternating events on two vertically offset track layers. While I haven't figured out how to gang select all events on either layer, at least it makes it much easier to proceed with CTL-click selection of all events on that particular layer.
There is no easy way. You would need a script like this one:
/**
* Program: SelectEveryOtherEvent.cs
* Author: John Rofrano (a.k.a. JohnnyRoy)
* Purpose: This script will select every other event on the selected tracks
* Updated: July 7, 2008
*
**/
using System;
using System.Windows.Forms;
using Sony.Vegas;
class EntryPoint
{
public void FromVegas(Vegas vegas)
{
foreach (Track track in vegas.Project.Tracks)
{
if (!track.Selected) continue;