Few indications in my opinion:
1) MFs starts advertising their 1yr, 3 yr, 5yr results.
2) Banks starts approaching you for investment plans
3) You see that job sector is stablizing and hike, promotions happening. All of sudden you approached by consultants and HR team looking in action.
4) One feels comfortable taking risks in the larket with cash which was
lying idel in the bank for past few years.
5) Your boss, freinds, relative is telling you his succeses in the stocks.
6) Price of brokerage stocks are approaching 52 week high
7) Leisure companies starts giving good qtrly results like TITAN, MAHINDRA
RESORTS etc.
If stock rise concides with many of above then one can safely say stocks are approaching dizziy heights :-)).